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{{Short description|High proper-motion Star}}
{{Short description|High proper-motion Star}}
{{Starbox begin|name=[[Henry Draper Catalogue|HD]] 28700}}
{{Starbox begin
| name = [[Henry Draper Catalogue|HD]] 28700
}}
{{Starbox observe
{{starbox observe|constell=[[Caelum]]|ra={{RA|04|29|20.09}}<ref name = GaiaDR2/>|dec={{DEC|-46|30|54.97}}<ref name = GaiaDR2/>|epoch=J2000|appmag_v={{val|6.12|0.01}}<ref name = Tycho2000/>}}
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
{{starbox character|class=K1 III<ref name = Houk1978/>|b-v=+1.06<ref name = HIP/>|type=[[red clump]]{{citation needed|date=July 2021}}}}
| constell = [[Caelum]]
{{Starbox astrometry|radial_v={{val|11.50|0.13}}<ref name = GaiaDR2/>|pm_footnote=<ref name = GaiaDR2/>|parallax_footnote=<ref name = GaiaDR2/>|parallax=8.4653|p_error=0.0274|prop_mo_ra={{val|51.226|0.048}}|prop_mo_dec={{val|36.423|0.059}}|absmag_v=+0.69<ref name = XHIP/>}}
| ra = {{RA|04|29|20.0860}}<ref name = EDR3/>
{{starbox detail|radius={{val|10.39|0.55|-1.03}}<ref name = GaiaDR2/>|luminosity={{val|54.7|-0.3}}<ref name = GaiaDR2/>|temperature={{val|4871|261|125|fmt=commas}}<ref name = GaiaDR2/>|mass={{val|2.48|0.51|1.57}}<ref name = Char2020/>|metal_fe=0.00<ref name = Char2020/>|gravity=2.46<ref name = Anders2019/>|rotational_velocity=<1<ref name = DeMed2014/>}}
| dec = {{DEC|-46|30|54.9738}}<ref name = EDR3/>
{{starbox catalog|names={{Odlist|Gould=5 G. Caeli|CD=-46 1427|HD=28700|HIP=20934|HR=1433|SAO=216832}}}}
| appmag_v = 6.12{{±|0.01}}<ref name = Tycho2000/>
{{starbox reference|Simbad=HR+1433}}
}}
{{Starbox character
| class = K1 III<ref name = Houk1978/>
| b-v = +1.06<ref name = Johnson1966/>
}}
{{Starbox astrometry
| radial_v = 10.7{{±|0.4}}<ref name = Gontcharov2006/>
| parallax = 8.4964
| p_error = 0.0265
| parallax_footnote = <ref name = EDR3/>
| prop_mo_ra = +51.283
| prop_mo_dec = +36.503
| pm_footnote = <ref name = EDR3/>
| absmag_v = +0.69<ref name = Anderson2012/>
}}
{{Starbox detail
| mass = 1.25<ref name = Anders2019/>
| radius = 11.3<ref name = Kervella2021/>
| luminosity = 56{{±|2}}<ref name = Charbonnel2020/>
| gravity = 2.45<ref name = Anders2019/>
| temperature = 4,760{{±|90}}<ref name = Charbonnel2020/>
| metal_fe = +0.08<ref name = Eggen1994/>
| rotational_velocity = <1<ref name = DeMederios2014/>
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist|CD = −46°1427|CPD = −46°433|GC = 5485|HD = 28700|HIP = 20934|HR = 1433|SAO = 216832|Gould = 5 G. Caeli}}<ref name = SIMBAD/><ref name = Gould1879/>
}}
{{Starbox reference
| Simbad= HR=1433
}}
{{starbox end}}
{{starbox end}}


'''HD 28700 (HR 1433)''' is a solitary star in the southern [[constellation]] [[Caelum]]. With an [[apparent magnitude]] of 6.12, it's only visible to the [[naked eye]] under ideal conditions. The star is located {{Convert|385|ly|pc}} based on [[parallax]], but is drifting away with a [[radial velocity]] of 11.5&nbsp;km/s.
'''HD 28700''' ('''HR 1433''') is a solitary [[star]] in the southern [[constellation]] [[Caelum]]. It has an [[apparent magnitude]] of 6.12,<ref name = Tycho2000/> making it visible to the [[naked eye]] under ideal conditions. [[Parallax]] measurements place the object at a distance of 384 [[light year]]s<ref name = EDR3/> and is currently receding with a heliocentric [[radial velocity]] of {{val|10.7|ul=km/s}}.<ref name = Gontcharov2006/>


⚫
HD 28700 has a [[stellar classification]] of K1 III,<ref name = Houk1978/> indicating that it is a [[red giant]]. It has 125% of the [[Sun's mass]]<ref name = Anders2019/> but has expanded to 11.3 times the [[Sun's radius|Sun's girth]].<ref name = Kervella2021/> It radiates at 56 times the [[Sun's luminosity]] from its swollen [[photosphere]] at an effective temperature of {{val|4760|ul=K|fmt=commas}},<ref name = Charbonnel2020/> giving it an orange hue. HD 28700 has a [[projected rotational velocity]] too low to be measured accurately due to it being less than {{val|1|ul=km/s}}.<ref name = DeMederios2014/> HD 28700 has 120% the abundance of [[iron]] relative to the [[Sun]].<ref name = Eggen1994/>
== Properties ==
⚫
HD 28700 has about 2.5 times the [[Sun's mass]], but has expanded to 10.39 times the [[Sun's radius|Sun's girth]]. It radiates at 54.7 times the [[Sun's luminosity]] from its swollen [[photosphere]] at an effective temperature of 4,871&nbsp;[[Kelvin|K]]. HD 28700 has a slow [[projected rotational velocity]] that is too low to be measured accurately, with it being less than 1&nbsp;km/s. HD 28700 has the same metal abundance as the Sun.


== References ==
== References ==
{{reflist||refs=<ref name = GaiaDR2>{{Cite DR2|4789242307202995968}}</ref>
{{reflist||refs=


<ref name = EDR3>{{Cite Gaia EDR3|4789242307202995968}}</ref>
⚫
<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |bibcode=2000A&A...355L..27H |language=en |issn=0004-6361}}</ref>


⚫
<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>
<ref name = HIP>{{cite journal |title=The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission |journal=ESA Special Publication |date=1997 |volume=1200 |bibcode=1997ESASP1200.....E |language=en |issn=1609-042X|author1=ESA }}</ref>


<ref name = Houk1978>{{cite book |last1=Houk |first1=Nancy |title=Michigan catalogue of two-dimensional spectral types for the HD stars |date=1978 |bibcode=1978mcts.book.....H|language=en}}</ref>
<ref name = Gontcharov2006>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>


<ref name = XHIP>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015|arxiv=1108.4971 |bibcode=2012AstL...38..331A |s2cid=119257644 }}</ref>
<ref name = Houk1978>{{cite journal | last=Houk | first=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | journal=Ann Arbor : Dept. of Astronomy | bibcode=1978mcts.book.....H | year=1978}}</ref>


<ref name = Char2020>{{cite journal |last1=Charbonnel |first1=C. |last2=Lagarde |first2=N. |last3=Jasniewicz |first3=G. |last4=North |first4=P. L. |last5=Shetrone |first5=M. |last6=Krugler Hollek |first6=J. |last7=Smith |first7=V. V. |last8=Smiljanic |first8=R. |last9=Palacios |first9=A. |last10=Ottoni |first10=G. |title=Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era |journal=Astronomy and Astrophysics |date=January 2020 |volume=633 |pages=A34 |doi=10.1051/0004-6361/201936360 |arxiv=1910.12732 |bibcode=2020A&A...633A..34C |s2cid=204907220 |language=en |issn=0004-6361}}</ref>
<ref name = Anderson2012>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971}}</ref>


<ref name = Anders2019>{{cite journal |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. |last5=Santiago |first5=B. X. |last6=Jordi |first6=C. |last7=Girardi |first7=L. |last8=Brown |first8=A. G. A. |last9=Matijevič |first9=G. |last10=Monari |first10=G. |last11=Cantat-Gaudin |first11=T. |last12=Weiler |first12=M. |last13=Khan |first13=S. |last14=Miglio |first14=A. |last15=Carrillo |first15=I. |last16=Romero-Gómez |first16=M. |last17=Minchev |first17=I. |last18=de Jong |first18=R. S. |last19=Antoja |first19=T. |last20=Ramos |first20=P. |last21=Steinmetz |first21=M. |last22=Enke |first22=H. |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 |journal=Astronomy and Astrophysics |date=August 2019 |volume=628 |pages=A94 |doi=10.1051/0004-6361/201935765 |arxiv=1904.11302 |bibcode=2019A&A...628A..94A |s2cid=131780028 |language=en |issn=0004-6361}}</ref>
<ref name = Charbonnel2020>{{cite journal | last1 = Charbonnel | first1 = C. | last2 = Lagarde | first2 = N. | last3 = Jasniewicz | first3 = G. | last4 = North | first4 = P. L. | last5 = Shetrone | first5 = M. | last6 = Krugler Hollek | first6 = J. | last7 = Smith | first7 = V. V. | last8 = Smiljanic | first8 = R. | last9 = Palacios | first9 = A. | last10 = Ottoni | first10 = G. | title = Lithium in red giant stars: Constraining non-standard mixing with large surveys in the ''Gaia'' era | journal = Astronomy & Astrophysics | date = January 2020 | volume = 633 | page = A34 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/201936360 | bibcode = 2020A&A...633A..34C | arxiv = 1910.12732 | doi-access = free}}</ref>


<ref name = DeMed2014>{{cite journal |last1=De Medeiros |first1=J. R. |last2=Alves |first2=S. |last3=Udry |first3=S. |last4=Andersen |first4=J. |last5=Nordström |first5=B. |last6=Mayor |first6=M. |title=A catalog of rotational and radial velocities for evolved stars. V. Southern stars |journal=Astronomy and Astrophysics |date=January 2014 |volume=561 |pages=A126 |doi=10.1051/0004-6361/201220762 |arxiv=1312.3474 |bibcode=2014A&A...561A.126D |s2cid=54046583 |language=en |issn=0004-6361}}</ref>}}{{Caelum}}
<ref name = Anders2019>{{cite journal |display-authors=1 |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. |last5=Santiago |first5=B. X. |last6=Jordi |first6=C. |last7=Girardi |first7=L. |last8=Brown |first8=A. G. A. |last9=Matijevič |first9=G. |last10=Monari |first10=G. |last11=Cantat-Gaudin |first11=T. |last12=Weiler |first12=M. |last13=Khan |first13=S. |last14=Miglio |first14=A. |last15=Carrillo |first15=I. |last16=Romero-Gómez |first16=M. |last17=Minchev |first17=I. |last18=de Jong |first18=R. S. |last19=Antoja |first19=T. |last20=Ramos |first20=P. |last21=Steinmetz |first21=M. |last22=Enke |first22=H. |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 |journal=Astronomy & Astrophysics |date=August 2019 |volume=628 |pages=A94 |doi=10.1051/0004-6361/201935765 |issn=0004-6361 |bibcode=2019A&A...628A..94A |arxiv=1904.11302 |doi-access=free}}</ref>


<ref name = DeMederios2014>{{cite journal |last1=De Medeiros |first1=J. R. |last2=Alves |first2=S. |last3=Udry |first3=S. |last4=Andersen |first4=J. |last5=Nordström |first5=B. |last6=Mayor |first6=M. |title=A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆ |journal=Astronomy & Astrophysics |date=January 2014 |volume=561 |pages=A126 |doi=10.1051/0004-6361/201220762 |issn=0004-6361 |bibcode=2014A&A...561A.126D |arxiv=1312.3474|doi-access=free}}</ref>

<ref name = Johnson1966>{{cite journal |last1=Johnson |first1=H. L. |last2=Mitchell |first2=R. I. |last3=Iriarte |first3=B. |last4=Wisniewski |first4=W. Z. |title=UBVRIJKL Photometry of the Bright Stars |journal=Communications of the Lunar and Planetary Laboratory |year=1966 |volume=4 |pages=99–110 |bibcode=1966CoLPL...4...99J}}</ref>

<ref name = Eggen1994>{{cite journal | last1 = Eggen | first1 = O. J. | title = Evolved GK stars near the Sun. 2: The young disk population | journal = The Astronomical Journal | date = February 1994 | volume = 107 | page = 594 | issn = 0004-6256 | doi = 10.1086/116879 | bibcode = 1994AJ....107..594E | doi-access = free }}</ref>

<ref name = Kervella2021>{{cite journal | last1 = Kervella | first1 = Pierre | last2 = Arenou | first2 = Frédéric | last3 = Thévenin | first3 = Frédéric | title = Stellar and substellar companions from <i>Gaia</i> EDR3 | journal = Astronomy & Astrophysics | year = 2022 | volume = 657 | page = A7 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/202142146 | bibcode = 2022A&A...657A...7K | arxiv = 2109.10912 | doi-access = free}}</ref>

<ref name = Gould1879>{{cite journal | last=Gould | first=Benjamin Apthorp | title=Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas | journal=Resultados del Observatorio Nacional Argentino | volume=1 | bibcode=1879RNAO....1.....G | year=1878 | page=}}</ref>

<ref name = SIMBAD>{{Cite simbad|title = HD 28700|access-date = June 17, 2022}}</ref>

}}
{{Stars of Caelum}}
[[Category:Gould objects|Caeli, 5]]
[[Category:Gould objects|Caeli, 5]]
[[Category:Henry Draper Catalogue objects|028700]]
[[Category:Henry Draper Catalogue objects|028700]]

Revision as of 18:48, 17 June 2022

HD 28700
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Caelum
Right ascension 04h 29m 20.0860s[1]
Declination −46° 30′ 54.9738″[1]
Apparent magnitude (V) 6.12±0.01[2]
Characteristics
Spectral type K1 III[3]
B−V color index +1.06[4]
Astrometry
Radial velocity (Rv)10.7±0.4[5] km/s
Proper motion (μ) RA: +51.283 mas/yr[1]
Dec.: +36.503 mas/yr[1]
Parallax (π)8.4964 ± 0.0265 mas[1]
Distance384 ± 1 ly
(117.7 ± 0.4 pc)
Absolute magnitude (MV)+0.69[6]
Details
Mass1.25[7] M☉
Radius11.3[8] R☉
Luminosity56±2[9] L☉
Surface gravity (log g)2.45[7] cgs
Temperature4,760±90[9] K
Metallicity [Fe/H]+0.08[10] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
5 G. Caeli, CD−46°1427, CPD−46°433, GC 5485, HD 28700, HIP 20934, HR 1433, SAO 216832[12][13]
Database references
SIMBADdata

HD 28700 (HR 1433) is a solitary star in the southern constellation Caelum. It has an apparent magnitude of 6.12,[2] making it visible to the naked eye under ideal conditions. Parallax measurements place the object at a distance of 384 light years[1] and is currently receding with a heliocentric radial velocity of 10.7 km/s.[5]

HD 28700 has a stellar classification of K1 III,[3] indicating that it is a red giant. It has 125% of the Sun's mass[7] but has expanded to 11.3 times the Sun's girth.[8] It radiates at 56 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,760 K,[9] giving it an orange hue. HD 28700 has a projected rotational velocity too low to be measured accurately due to it being less than 1 km/s.[11] HD 28700 has 120% the abundance of iron relative to the Sun.[10]

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Ann Arbor : Dept. of Astronomy. Bibcode:1978mcts.book.....H.
  4. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  6. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  7. ^ a b c Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  8. ^ a b Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  9. ^ a b c Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. eISSN 1432-0746. ISSN 0004-6361.
  10. ^ a b Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode:1994AJ....107..594E. doi:10.1086/116879. ISSN 0004-6256.
  11. ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361.
  12. ^ "HD 28700". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 17, 2022.
  13. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
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