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{{Infobox planet
{{Infobox planet
| minorplanet = yes
| minorplanet = yes
| mpc_name = (1128) Astrid
| name = 1128 Astrid
| background = #FFFFC0
| background = #D6D6D6
| image =
| name = 1128 Astrid
| image_size =
| discoverer = Delporte, E.
| caption =
| discovered = 10 March 1929
| discovery_ref = &thinsp;<ref name="jpldata" />
| designation = 1929 EB
| discoverer = [[Eugène Delporte|E. Delporte]]
| minor planet category = [[main belt]], [[Astrid family]]
| discovery_site = [[Royal Observatory of Belgium|Uccle Obs.]]
| epoch = 31 July 2016 ([[Julian day|JD]] 2457600.5)
| discovered = 10 March 1929
| aphelion = {{Convert|2.9166707|AU|Gm|abbr=on|lk=on}}
| mpc_name = (1128) Astrid
| perihelion = {{Convert|2.6556359|AU|Gm|abbr=on}}
| alt_names = 1929 EB{{·}}{{mp|1949 QF|2}}<br />{{mp|1954 UL|3}}{{·}}1964 VW<br />{{mp|1972 LM|1}}{{·}}A917 SQ<br />A920 JA
| semimajor = {{Convert|2.7861533|AU|Gm|abbr=on}}
| pronounced =
| eccentricity = 0.0468450
| named_after = [[Astrid of Sweden]]<br />{{nowrap|{{small|(Queen consort of the Belgians)}}}}<ref name="springer" />
| period = 4.65 [[Julian year (astronomy)|yr]] (1698.7 [[Julian year (astronomy)|d]])
| adjectives = Astridian
| inclination = 1.014507°
| mp_category = [[main-belt]]{{·}}{{small|([[Kirkwood gap|middle]])}}{{·}}[[Astrid family|Astrid]]&thinsp;<ref name="Ferret" />
| asc_node = 59.40755°
| orbit_ref = &thinsp;<ref name="jpldata" />
| mean_anomaly = 162.98069[[Degree (angle)|°]]
| epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5)
| arg_peri = 234.90836°
| dimensions =
| uncertainty = 0
| observation_arc = 97.07 yr (35,455 days)
| albedo = {{val|0.0770|0.010}}
| aphelion = 2.9171 [[Astronomical unit|AU]]
| abs_magnitude = 10.9
| perihelion = 2.6577 AU
| mean_motion = {{Deg2DMS|0.2119320|sup=ms}} / day
| semimajor = 2.7874 AU
| orbit_ref = <ref name="a" />
| eccentricity = 0.0465
| observation_arc = 95.88 yr (35021 days)
| period = 4.65 [[Julian year (astronomy)|yr]] (1,700 days)
| uncertainty = 0
| mean_anomaly = 248.28[[Degree (angle)|°]]
| rotation = {{Convert|10.228|h|d|abbr=on|lk=on}}
| mean_radius = {{val|17.345|1.05}} [[Kilometre|km]]
| mean_motion = {{Deg2DMS|0.2118|sup=ms}} / day
| inclination = 1.0145°
| moid = {{Convert|1.6394|AU|Gm|abbr=on}}
| asc_node = 59.420°
| jupiter_moid = {{Convert|2.1606|AU|Gm|abbr=on}}
| tisserand = 3.329
| arg_peri = 234.37°
| dimensions = {{val|33.28|9.67}} km<ref name="Nugent-2015" /><br />34.60 km {{small|(derived)}}<ref name="lcdb" /><br />{{val|34.69|2.1}} km<ref name="SIMPS" /><br />{{val|41.851|0.278}} km<ref name="Masiero-2014" /><br />{{val|41.97|0.72}} km<ref name="AKARI" /><br />{{val|44.784|0.912}} km<ref name="WISE" /><br />{{val|45.03|10.37}} km<ref name="Nugent-2016" /><br />{{val|52.48|0.40}} km<ref name="Masiero-2012" />
| rotation = {{val|10.2|0.1}} [[Hour|h]]<ref name="geneva-obs" /><br />{{val|10.228|0.002}} h<ref name="geneva-obs" /><br />{{val|10.229|0.0031}} h<ref name="Waszczak-2015" />
| albedo = {{val|0.031|0.004}}<ref name="Masiero-2012" /><ref name="Masiero-2012" /><br />{{val|0.04|0.02}}<ref name="Nugent-2016" /><br />{{val|0.0462|0.0181}}<ref name="WISE" /><br />{{val|0.053|0.002}}<ref name="AKARI" /><br />{{val|0.06|0.03}}<ref name="Nugent-2015" /><br />0.0644 {{small|(derived)}}<ref name="lcdb" /><br />{{val|0.0770|0.010}}<ref name="SIMPS" />
| spectral_type = [[SMASS classification|SMASS]] {{=}} [[C-type asteroid|C]]&thinsp;<ref name="jpldata" />{{·}}[[C-type asteroid|C]]&thinsp;<ref name="lcdb" />
| abs_magnitude = {{val|10.588|0.002}} {{small|(R)}}<ref name="Waszczak-2015" />{{·}}10.70<ref name="SIMPS" /><ref name="AKARI" /><ref name="WISE" />{{·}}10.80<ref name="Masiero-2012" />{{·}}10.90<ref name="jpldata" /><ref name="Nugent-2015" /><ref name="lcdb" />{{·}}10.93<ref name="Nugent-2016" />{{·}}{{val|11.02|0.35}}<ref name="Veres-2015" />
}}
}}


'''1128 Astrid''', provisional designation {{mpf|1929 EB}}, is a carbonaceous Astridian [[asteroid]] from the central region of the [[asteroid belt]]. It is the parent body of the [[Astrid family]] and measures approximately 40 kilometers in diameter.
'''1128 Astrid''' is a [[main belt asteroid]] orbiting the [[Sun]].Approximately 35 kilometers in diameter, it makes a revolution around the Sun once every 5 years. It was discovered by [[Eugène Joseph Delporte]] at [[Uccle]], Belgium on March 10, 1929.<ref name="a">{{cite web | title=JPL Small-Body Database Browser | url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1128 | accessdate= 1 May 2016 }}</ref> It was named for H.M. [[Astrid of the Belgians|Astrid]], Queen of the Belgians. Its provisional designation was 1929 EB.<ref>{{cite book |last= Schmadel |first= Lutz D. |title= Dictionary of Minor Planet Names |url=https://books.google.com/books?id=aeAg1X7afOoC&pg=PA94&dq=1128+Astrid&hl=sv&sa=X&ei=_tzNUqzXHoX_ygOV5YCgBQ&ved=0CEAQ6AEwAg#v=onepage&q=1128%20Astrid&f=false|publisher= Springer |date= 2003 |isbn= 3-540-00238-3 }}</ref>


The asteroid was discovered by Belgian astronomer [[Eugène Delporte]] at the [[Royal Observatory of Belgium]] in Uccle on 10 March 1929, and later named for [[Astrid of Sweden]], Queen consort of the Belgians.<ref name="springer" /><ref name="MPC-object" />
==References==
{{Reflist}}


== Orbit and classification ==
==External links==

''Astrid'' is the parent body of the [[Astrid family]] ({{small|[[FIN tbl#515|515]]}}), a smaller [[asteroid family]] of nearly 500 carbonaceous members. It is located in the outermost central main-belt, near a prominent [[Kirkwood gap]], that marks the 5:2 [[orbital resonance]] with Jupiter, and divides the asteroid belt into a central and outer part.<ref name="Ferret" /><ref name="Vokrouhlicky-2006b" /><ref name="Nesvorny-2014" />{{rp|23}}

''Astrid'' orbits the Sun at a distance of 2.7–2.9&nbsp;[[Astronomical unit|AU]] once every 4 years and 8 months (1,700 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.05 and an [[orbital inclination|inclination]] of 1[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" />

The asteroid was first identified as {{mpf|A917 SQ}} at the Simeiz Observatory in September 1917. The body's [[observation arc]] begins with its identification as {{mpf|A920 JA}} at [[Heidelberg Observatory]] in May 1920, nearly 9 years prior to its official discovery observation at Uccle.<ref name="MPC-object" />

== Physical characteristics ==

In the [[SMASS classification]], ''Astrid'' is a carbonaceous [[C-type asteroid]], which corresponds to the overall [[Asteroid spectral type|spectral type]] of the Astrid family.<ref name="jpldata" />

=== Rotation period ===

In September 2005, a rotational [[lightcurve]] of ''Astrid'' was obtained from photometric observations by French amateur astronomer [[René Roy (astronomer)|René Roy]]. Lightcurve analysis gave a [[rotation period]] of 10.228 hours with a brightness variation of 0.29 [[Magnitude (astronomy)|magnitude]] ({{small|[[LCDB quality code|U=2+]]}}).<ref name="geneva-obs" /> In October 2010, additional lightcurves were obtained at the [[Palomar Transient Factory]] in California, as well as by astronomers Eric Barbotin and [[Raoul Behrend]], which gave a concurring period of 10.2 and 10.229 hours with an amplitude of 0.10 and 0.13 magnitude, respectively ({{small|[[LCDB quality code|U=1/2]]}}).<ref name="geneva-obs" /><ref name="Waszczak-2015" />

=== Diameter and albedo ===

According to the surveys carried out by the Infrared Astronomical Satellite [[IRAS]], the Japanese [[Akari (satellite)|Akari satellite]] and the [[NEOWISE]] mission of NASA's [[Wide-field Infrared Survey Explorer]], ''Astrid'' measures between 33.28 and 52.48 kilometers in diameter and its surface has an [[astronomical albedo|albedo]] between 0.031 and 0.077.<ref name="Nugent-2015" /><ref name="SIMPS" /><ref name="Masiero-2014" /><ref name="AKARI" /><ref name="WISE" /><ref name="Nugent-2016" /><ref name="Masiero-2012" />

The ''Collaborative Asteroid Lightcurve Link'' derives an albedo of 0.0644 and a diameter of 34.60 kilometers based on an [[absolute magnitude]] of 10.9.<ref name="lcdb" />

== Naming ==

This [[minor planet]] was named in memory of [[Astrid of Sweden]] (1905–1935), Queen consort of the Belgians, who died at the age of 29 in a car accident while on vacation in Switzerland.<ref name="springer" /> The official naming citation was mentioned in ''[[The Names of the Minor Planets]]'' by [[Paul Herget]] in 1955 ({{small|[[Herget's discovery circumstances|H 106]]}}).<ref name="springer" />

== References ==
{{reflist|30em|refs=

<ref name="jpldata">{{cite web
|type = 2017-06-04 last obs.
|title = JPL Small-Body Database Browser: 1128 Astrid (1929 EB)
|url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001128
|publisher = Jet Propulsion Laboratory
|accessdate = 1 September 2017}}</ref>

<ref name="springer">{{cite book
|title = Dictionary of Minor Planet Names – (1128) Astrid
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 96
|date = 2007
|url = https://link.springer.com/referenceworkentry/10.1007/978-3-540-29925-7_1129
|isbn = 978-3-540-00238-3
|accessdate = 1 September 2017}}</ref>

<ref name="MPC-object">{{cite web
|title = 1128 Astrid (1929 EB)
|work = Minor Planet Center
|url = http://www.minorplanetcenter.net/db_search/show_object?object_id=1128
|accessdate = 1 September 2017}}</ref>

<ref name="geneva-obs">{{cite web
|title = Asteroids and comets rotation curves – (1128) Astrid
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page3cou.html#001128
|accessdate = 1 September 2017}}</ref>

<ref name="Masiero-2014">{{cite journal
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = T. |last2 = Grav
|first3 = A. K. |last3 = Mainzer
|first4 = C. R. |last4 = Nugent
|first5 = J. M. |last5 = Bauer
|first6 = R. |last6 = Stevenson
|first7 = S. |last7 = Sonnett
|date = August 2014
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M
|journal = The Astrophysical Journal
|volume = 791
|issue = 2
|page = 11
|bibcode = 2014ApJ...791..121M
|doi = 10.1088/0004-637X/791/2/121
|arxiv = 1406.6645
|access-date= 1 September 2017}}</ref>

<ref name="Vokrouhlicky-2006b">{{Cite journal
|first1 = D. |last1 = Vokrouhlický
|first2 = M. |last2 = Broz
|first3 = W. F. |last3 = Bottke
|first4 = D. |last4 = Nesvorný
|first5 = A. |last5 = Morbidelli
|date = May 2006
|title = Yarkovsky/YORP chronology of asteroid families
|url = https://www.boulder.swri.edu/~davidn/papers/chron.pdf
|journal = Icarus
|volume = 182
|issue = 1
|pages = 118–142
|bibcode = 2006Icar..182..118V
|doi = 10.1016/j.icarus.2005.12.010
|access-date= 1 September 2017}}</ref>

<ref name="Ferret">{{cite web
|title = Small Bodies Data Ferret
|work = Nesvorny HCM Asteroid Families V3.0
|url = http://sbntools.psi.edu/ferret/PropertySearch/familyForm.action
|accessdate = 1 September 2017}}</ref>

<ref name="Nesvorny-2014">{{Cite journal
|first1 = D. |last1 = Nesvorný
|first2 = M. |last2 = Broz
|first3 = V. |last3 = Carruba
|date = December 2014
|title = Identification and Dynamical Properties of Asteroid Families
|url = https://arxiv.org/pdf/1502.01628.pdf
|journal = Asteroids IV
|pages = 297–321
|bibcode = 2015aste.book..297N
|doi = 10.2458/azu_uapress_9780816532131-ch016
|arxiv = 1502.01628
|access-date= 1 September 2017}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (1128) Astrid
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1128%7CAstrid
|accessdate = 1 September 2017}}</ref>

<ref name="Masiero-2012">{{cite journal
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
|access-date= 1 September 2017}}</ref>

<ref name="Nugent-2015">{{cite journal
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Masiero
|first4 = J. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = T. |last6 = Grav
|first7 = E. |last7 = Kramer
|first8 = S. |last8 = Sonnett
|first9 = R. |last9 = Stevenson
|first10 = E. L. |last10 = Wright
|date = December 2015
|title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N
|journal = The Astrophysical Journal
|volume = 814
|issue = 2
|page = 13
|bibcode = 2015ApJ...814..117N
|doi = 10.1088/0004-637X/814/2/117
|arxiv = 1509.02522
|access-date= 1 September 2017}}</ref>

<ref name="Nugent-2016">{{cite journal
|display-authors = 6
|first1 = C. R. |last1 = Nugent
|first2 = A. |last2 = Mainzer
|first3 = J. |last3 = Bauer
|first4 = R. M. |last4 = Cutri
|first5 = E. A. |last5 = Kramer
|first6 = T. |last6 = Grav
|first7 = J. |last7 = Masiero
|first8 = S. |last8 = Sonnett
|first9 = E. L. |last9 = Wright
|date = September 2016
|title = NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016AJ....152...63N
|journal = The Astronomical Journal
|volume = 152
|issue = 3
|page = 12
|bibcode = 2016AJ....152...63N
|doi = 10.3847/0004-6256/152/3/63
|arxiv = 1606.08923
|access-date= 1 September 2017}}</ref>

<ref name="AKARI">{{cite journal
|display-authors = 6
|first1 = Fumihiko |last1 = Usui
|first2 = Daisuke |last2 = Kuroda
|first3 = Thomas G. |last3 = Müller
|first4 = Sunao |last4 = Hasegawa
|first5 = Masateru |last5 = Ishiguro
|first6 = Takafumi |last6 = Ootsubo
|first7 = Daisuke |last7 = Ishihara
|first8 = Hirokazu |last8 = Kataza
|first9 = Satoshi |last9 = Takita
|first10 = Shinki |last10 = Oyabu
|first11 = Munetaka |last11 = Ueno
|first12 = Hideo |last12 = Matsuhara
|first13 = Takashi |last13 = Onaka
|date = October 2011
|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey
|url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html
|journal = Publications of the Astronomical Society of Japan
|volume = 63
|issue = 5
|pages = 1117–1138
|bibcode = 2011PASJ...63.1117U
|doi = 10.1093/pasj/63.5.1117
|access-date= 1 September 2017}}</ref>

<ref name="SIMPS">{{cite journal
|first1 = E. F. |last1 = Tedesco
|first2 = P. V. |last2 = Noah
|first3 = M. |last3 = Noah
|first4 = S. D. |last4 = Price
|date = October 2004
|title = IRAS Minor Planet Survey V6.0
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004PDSS...12.....T
|journal = NASA Planetary Data System
|bibcode = 2004PDSS...12.....T
|access-date= 1 September 2017}}</ref>

<ref name="WISE">{{cite journal
|display-authors = 6
|first1 = A. |last1 = Mainzer
|first2 = T. |last2 = Grav
|first3 = J. |last3 = Masiero
|first4 = E. |last4 = Hand
|first5 = J. |last5 = Bauer
|first6 = D. |last6 = Tholen
|first7 = R. S. |last7 = McMillan
|first8 = T. |last8 = Spahr
|first9 = R. M. |last9 = Cutri
|first10 = E. |last10 = Wright
|first11 = J. |last11 = Watkins
|first12 = W. |last12 = Mo
|first13 = C. |last13 = Maleszewski
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://arxiv.org/pdf/1109.6407v1.pdf
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|arxiv = 1109.6407
|access-date= 1 September 2017}}</ref>

<ref name="Waszczak-2015">{{cite journal
|display-authors = 6
|first1 = Adam |last1 = Waszczak
|first2 = Chan-Kao |last2 = Chang
|first3 = Eran O. |last3 = Ofek
|first4 = Russ |last4 = Laher
|first5 = Frank |last5 = Masci
|first6 = David |last6 = Levitan
|first7 = Jason |last7 = Surace
|first8 = Yu-Chi |last8 = Cheng
|first9 = Wing-Huen |last9 = Ip
|first10 = Daisuke |last10 = Kinoshita
|first11 = George |last11 = Helou
|first12 = Thomas A. |last12 = Prince
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W
|journal = The Astronomical Journal
|volume = 150
|issue = 3
|page = 35
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|arxiv = 1504.04041
|access-date= 1 September 2017}}</ref>

<ref name="Veres-2015">{{cite journal
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|access-date= 1 September 2017}}</ref>

}} <!-- end of reflist -->

== External links ==
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info])
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
* [http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* [http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.6&n=1128 (1128) Astrid at AstDyS-2], Asteroids Dynamic Site
* {{JPL small body}}
* {{JPL small body}}


{{Minor planets navigator|1127 Mimi|number=1128|1129 Neujmina}}
{{Minor planets navigator |1127 Mimi |number=1128 |1129 Neujmina}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}


{{DEFAULTSORT:001128}}
{{DEFAULTSORT:Astrid}}
[[Category:Main-belt asteroids|001128]]
[[Category:Astrid asteroids|001128]]
[[Category:Numbered minor planets|001128]]
[[Category:Numbered minor planets|001128]]
[[Category:Discoveries by Eugène Joseph Delporte|Astrid]]
[[Category:Discoveries by Eugène Joseph Delporte]]
[[Category:Minor planets named for people|Astrid]]
[[Category:Minor planets named for people]]
[[Category:Named minor planets|Astrid]]
[[Category:Named minor planets]]
[[Category:C-type asteroids (SMASS)|001128]]
[[Category:C-type asteroids (SMASS)|001128]]
[[Category:Astronomical objects discovered in 1929|19290310]]
[[Category:Astronomical objects discovered in 1929|19290310]]

Revision as of 00:30, 1 September 2017

1128 Astrid
Discovery [1]
Discovered byE. Delporte
Discovery siteUccle Obs.
Discovery date10 March 1929
Designations
(1128) Astrid
Named after
Astrid of Sweden
(Queen consort of the Belgians)[2]
1929 EB · 1949 QF2
1954 UL3 · 1964 VW
1972 LM1 · A917 SQ
A920 JA
main-belt · (middle) · Astrid [3]
AdjectivesAstridian
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc97.07 yr (35,455 days)
Aphelion2.9171 AU
Perihelion2.6577 AU
2.7874 AU
Eccentricity0.0465
4.65 yr (1,700 days)
248.28°
0° 12m 42.48s / day
Inclination1.0145°
59.420°
234.37°
Physical characteristics
Dimensions33.28±9.67 km[4]
34.60 km (derived)[5]
34.69±2.1 km[6]
41.851±0.278 km[7]
41.97±0.72 km[8]
44.784±0.912 km[9]
45.03±10.37 km[10]
52.48±0.40 km[11]
10.2±0.1 h[12]
10.228±0.002 h[12]
10.229±0.0031 h[13]
0.031±0.004[11][11]
0.04±0.02[10]
0.0462±0.0181[9]
0.053±0.002[8]
0.06±0.03[4]
0.0644 (derived)[5]
0.0770±0.010[6]
SMASS = C [1] · C [5]
10.588±0.002 (R)[13] · 10.70[6][8][9] · 10.80[11] · 10.90[1][4][5] · 10.93[10] · 11.02±0.35[14]

1128 Astrid, provisional designation 1929 EB, is a carbonaceous Astridian asteroid from the central region of the asteroid belt. It is the parent body of the Astrid family and measures approximately 40 kilometers in diameter.

The asteroid was discovered by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle on 10 March 1929, and later named for Astrid of Sweden, Queen consort of the Belgians.[2][15]

Orbit and classification

Astrid is the parent body of the Astrid family (515), a smaller asteroid family of nearly 500 carbonaceous members. It is located in the outermost central main-belt, near a prominent Kirkwood gap, that marks the 5:2 orbital resonance with Jupiter, and divides the asteroid belt into a central and outer part.[3][16][17]: 23 

Astrid orbits the Sun at a distance of 2.7–2.9 AU once every 4 years and 8 months (1,700 days). Its orbit has an eccentricity of 0.05 and an inclination of 1° with respect to the ecliptic.[1]

The asteroid was first identified as A917 SQ at the Simeiz Observatory in September 1917. The body's observation arc begins with its identification as A920 JA at Heidelberg Observatory in May 1920, nearly 9 years prior to its official discovery observation at Uccle.[15]

Physical characteristics

In the SMASS classification, Astrid is a carbonaceous C-type asteroid, which corresponds to the overall spectral type of the Astrid family.[1]

Rotation period

In September 2005, a rotational lightcurve of Astrid was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 10.228 hours with a brightness variation of 0.29 magnitude (U=2+).[12] In October 2010, additional lightcurves were obtained at the Palomar Transient Factory in California, as well as by astronomers Eric Barbotin and Raoul Behrend, which gave a concurring period of 10.2 and 10.229 hours with an amplitude of 0.10 and 0.13 magnitude, respectively (U=1/2).[12][13]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Astrid measures between 33.28 and 52.48 kilometers in diameter and its surface has an albedo between 0.031 and 0.077.[4][6][7][8][9][10][11]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0644 and a diameter of 34.60 kilometers based on an absolute magnitude of 10.9.[5]

Naming

This minor planet was named in memory of Astrid of Sweden (1905–1935), Queen consort of the Belgians, who died at the age of 29 in a car accident while on vacation in Switzerland.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 106).[2]

References

  1. ^ a b c d e f "JPL Small-Body Database Browser: 1128 Astrid (1929 EB)" (2017-06-04 last obs.). Jet Propulsion Laboratory. Retrieved 1 September 2017.
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1128) Astrid. Springer Berlin Heidelberg. p. 96. ISBN 978-3-540-00238-3. Retrieved 1 September 2017.
  3. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 1 September 2017.
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 1 September 2017.
  5. ^ a b c d e "LCDB Data for (1128) Astrid". Asteroid Lightcurve Database (LCDB). Retrieved 1 September 2017.
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 1 September 2017.
  7. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 1 September 2017.
  8. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 1 September 2017.
  9. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 September 2017.
  10. ^ a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 1 September 2017.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  11. ^ a b c d e Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 1 September 2017.
  12. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1128) Astrid". Geneva Observatory. Retrieved 1 September 2017.
  13. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 1 September 2017.
  14. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 September 2017.
  15. ^ a b "1128 Astrid (1929 EB)". Minor Planet Center. Retrieved 1 September 2017.
  16. ^ Vokrouhlický, D.; Broz, M.; Bottke, W. F.; Nesvorný, D.; Morbidelli, A. (May 2006). "Yarkovsky/YORP chronology of asteroid families" (PDF). Icarus. 182 (1): 118–142. Bibcode:2006Icar..182..118V. doi:10.1016/j.icarus.2005.12.010. Retrieved 1 September 2017.
  17. ^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 1 September 2017.

External links

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