Gliese 445: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
Gianmt (talk | contribs)
3 edits
m Made the words "red dwarf" pointing to the relative page of the wiki
Solar encounter<ref name="Bobylev:arXiv1003.2160"/> + Wikisky + clean-up
Line 23: Line 23:
}}
}}
{{Starbox detail
{{Starbox detail
| mass=0.30<ref name=zkh>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/101/catalog&recno=168 AC+79 3888], entry, Catalogue of nearest stars until 10pc, V. A. Zakhozhaj, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/101 V/101].</ref>
| mass=0.15<ref name="Bobylev:arXiv1003.2160"/>–0.30<ref name=zkh>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/101/catalog&recno=168 AC+79 3888], entry, Catalogue of nearest stars until 10pc, V. A. Zakhozhaj, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/101 V/101].</ref>
| radius=0.320<ref name=zkh />
| radius=0.320<ref name=zkh />
}}
}}
Line 35: Line 35:
{{Starbox end}}
{{Starbox end}}


'''AC+79 3888''' is an [[Stellar classification#Class M|M-type]] [[main sequence]] [[star]] in the constellations of [[Ophiuchus]] and [[Camelopardalis]], close to [[Polaris]]. It has no name other than its catalog designations. AC+79 3888 is currently 17.6 light years away from Earth and has [[apparent visual magnitude]] 11.<ref name=simbad /> It is visible to people north of the [[Tropic of Cancer]] all night long, but not to the naked eye.<ref name="Littmann">Page 168, ''Planets Beyond: Discovering the Outer Solar System'', Mark Littmann, Mineola, New York: Courier Dover Publications, 2004, ISBN 0486436020.</ref>
'''AC+79 3888''' is an [[Stellar classification#Class M|M-type]] [[main sequence]] [[star]] in the constellations of [[Ophiuchus]] and [[Camelopardalis]], close to [[Polaris]]. It has no name other than its catalog designations. AC+79 3888 is currently 17.6 [[light-year]]s from the Sun and has an [[apparent magnitude]] of 10.8.<ref name=simbad /> It is visible to people north of the [[Tropic of Cancer]] all night long, but not to the naked eye.<ref name="Littmann">Page 168, ''Planets Beyond: Discovering the Outer Solar System'', Mark Littmann, Mineola, New York: Courier Dover Publications, 2004, ISBN 0486436020.</ref>


== Voyager 1 ==
The star is notable because the ''[[Voyager 1]]'' probe will pass within 1.6 light years of it in about 40,000 years.<ref>[http://voyager.jpl.nasa.gov/mission/interstellar.html NASA – Voyager - Mission - Interstellar Mission<!-- Bot generated title -->]</ref> Because the star is a [[red dwarf]] with only a mass included between a quarter to a third of the mass of our [[Sun]], scientists do not believe that it can support life as we know it.<ref name="Littmann"/>
The star is notable because the ''[[Voyager 1]]'' probe will pass within 1.6 light years of it in about 40,000 years.<ref>[http://voyager.jpl.nasa.gov/mission/interstellar.html NASA – Voyager - Mission - Interstellar Mission<!-- Bot generated title -->]</ref> Because the star is a [[red dwarf]] with only a mass included between a quarter to a third of the mass of our [[Sun]], scientists do not believe that it can support life as we know it.<ref name="Littmann"/>


== Solar encounter ==
While the Voyager probe flies through space slowly closing on AC+79 3888, the star is rapidly approaching the Sun. At the time the probe passes AC+79 3888, the star will be just 3 light-years from our own Sun, but with less than half the brightness necessary to be seen with the naked eye.<ref name="Littmann"/>
While the Voyager probe flies through space slowly closing on AC+79 3888, the star is rapidly approaching the Sun. At the time the probe passes AC+79 3888, the star will be about 1.059 [[parsec]]s (3.45 light-years) from the Sun,<ref name="Bobylev:arXiv1003.2160">{{cite journal |last=Bobylev |first=Vadim V. |authorlink= |year=2010 |month=March |title=Searching for Stars Closely Encountering with the Solar System |journal=Astronomy Letters |volume=36 |issue=3 |pages=220–226 |doi=10.1134/S1063773710030060 |url=http://arxiv.org/abs/1003.2160 }} </ref> but with less than half the brightness necessary to be seen with the naked eye.<ref name="Littmann"/>


==X-ray source==
==X-ray source==
Line 47: Line 49:
==References==
==References==
{{Reflist}}
{{Reflist}}

== External links ==
*Wikisky [http://www.wikisky.org/?ra=11.794826499999997&de=78.69115999999998&zoom=8&show_grid=1&show_constellation_lines=1&show_constellation_boundaries=1&show_const_names=0&show_galaxies=1&show_box=1&box_ra=11.7948265&box_de=78.69116&box_width=50&box_height=50&img_source=DSS2 image] of TYC 4553-192-1 (AC+79 3888)


{{DEFAULTSORT:Ac+79 3888}}
{{DEFAULTSORT:Ac+79 3888}}

Revision as of 22:06, 20 March 2010

AC+79 3888
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Camelopardalis
Right ascension 11h 47m 41.3771s[1]
Declination +78° 41′ 28.178″[1]
Apparent magnitude (V) 10.78[1]
Characteristics
Spectral type M3.5[1]
B−V color index 1.6[1]
V−R color index 0.8[1]
R−I color index 0.8[1]
Astrometry
Radial velocity (Rv)−119[1] km/s
Proper motion (μ) RA: 743.58[1] mas/yr
Dec.: 480.47[1] mas/yr
Parallax (π)185.52 ± 1.43 mas[1]
Distance17.6 ± 0.1 ly
(5.39 ± 0.04 pc)
Details
Mass0.15[2]–0.30[3] M☉
Radius0.320[3] R☉
Database references
SIMBADdata
ARICNSdata
Other designations
G 254-29, Gliese 445, HIP 57544, LFT 849, LHS 2459, LTT 13235, NLTT 28539[1]

AC+79 3888 is an M-type main sequence star in the constellations of Ophiuchus and Camelopardalis, close to Polaris. It has no name other than its catalog designations. AC+79 3888 is currently 17.6 light-years from the Sun and has an apparent magnitude of 10.8.[1] It is visible to people north of the Tropic of Cancer all night long, but not to the naked eye.[4]

Voyager 1

The star is notable because the Voyager 1 probe will pass within 1.6 light years of it in about 40,000 years.[5] Because the star is a red dwarf with only a mass included between a quarter to a third of the mass of our Sun, scientists do not believe that it can support life as we know it.[4]

Solar encounter

While the Voyager probe flies through space slowly closing on AC+79 3888, the star is rapidly approaching the Sun. At the time the probe passes AC+79 3888, the star will be about 1.059 parsecs (3.45 light-years) from the Sun,[2] but with less than half the brightness necessary to be seen with the naked eye.[4]

X-ray source

AC+79 3888, aka Gliese 445, emits X-rays.[6]

References

  1. ^ a b c d e f g h i j k l m LHS 2459 -- High proper-motion Star, database entry, SIMBAD. Accessed on line July 29, 2008.
  2. ^ a b Bobylev, Vadim V. (2010). "Searching for Stars Closely Encountering with the Solar System". Astronomy Letters. 36 (3): 220–226. doi:10.1134/S1063773710030060. {{cite journal}}: Unknown parameter |month= ignored (help)
  3. ^ a b AC+79 3888, entry, Catalogue of nearest stars until 10pc, V. A. Zakhozhaj, CDS ID V/101.
  4. ^ a b c Page 168, Planets Beyond: Discovering the Outer Solar System, Mark Littmann, Mineola, New York: Courier Dover Publications, 2004, ISBN 0486436020.
  5. ^ NASA – Voyager - Mission - Interstellar Mission
  6. ^ Schmitt JHMM, Fleming TA, Giampapa MS. "The X-Ray View of the Low-Mass Stars in the Solar Neighborhood". Ap J. 450 (9): 392–400. doi:10.1086/176149. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)

External links

  • Wikisky image of TYC 4553-192-1 (AC+79 3888)
Stub icon

This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Gliese_445&oldid=351054240"