HD 102365: Difference between revisions
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'''HR 4523''' is a [[binary star]] system that is located in the [[constellation]] of [[Centaurus]]. The larger member of the system is a G-type star that is smaller than the [[Sun]] but of similar mass. It is orbited by a faint M-type star at an average separation of about 235 [[Astronomical Unit]]s (A.U.), (or 235 times the separation of the [[Earth]] from the Sun). By comparison, Neptune orbits at an average distance of 30 A.U. |
'''HR 4523''' is a [[binary star]] system that is located in the [[constellation]] of [[Centaurus]]. The larger member of the system is a G-type star that is smaller than the [[Sun]] but of similar mass. It is orbited by a faint M-type star at an average separation of about 235 [[Astronomical Unit]]s (A.U.), (or 235 times the separation of the [[Earth]] from the Sun). By comparison, Neptune orbits at an average distance of 30 A.U. |
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This star is believed to be orbited by a Neptune-like planet with a mass 16 times that of the Earth. The orbital period of this planet is 122.1 days. No other planets have been discovered orbiting this star.<ref name=apj727_103/> It is a member of the [[Epsilon Indi]] [[Stellar association|Moving Group]], although it is most likely an interloper. (The star is older and has a different composition than the other group members.)<ref name="aaa68" /> |
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==References== |
==References== |
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{{reflist |
{{reflist|refs= |
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<ref name=apj727_103>{{cite journal | first=C. G. | last=Tinney | coauthors=''et al.'' | title=The Anglo-Australian Planet Search. XX. A Solitary Ice-giant Planet Orbiting HD 102365 | journal=The Astrophysical Journal | year=2011 | volume=727 | page=103 | doi=10.1088/0004-637X/727/2/103 }}</ref> |
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}} |
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==External links== |
==External links== |
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[[Category:HIP objects|57433]] |
[[Category:HIP objects|57433]] |
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[[Category:HR objects|4523]] |
[[Category:HR objects|4523]] |
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[[Category:Planetary systems]] |
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[[es:HR 4523]] |
[[es:HR 4523]] |
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Revision as of 23:58, 11 January 2011
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 11h 46m 31.0720s |
| Declination | −40° 30′ 01.274″ |
| Apparent magnitude (V) | 4.89/15 |
| Characteristics | |
| Spectral type | G5V |
| U−B color index | 0.10 |
| B−V color index | 0.66 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | 15.3±0.9 km/s |
| Proper motion (μ) | RA: -1531.62 mas/yr Dec.: 403.48 mas/yr |
| Parallax (π) | 108.23 ± 0.70 mas |
| Distance | 30.1 ± 0.2 ly (9.24 ± 0.06 pc) |
| Details | |
| Mass | 0.7[1] M☉ |
| Luminosity | 0.85[2] L☉ |
| Temperature | 5,643[2] K |
| Metallicity | [Fe/H]=-0.28[2] |
| Age | (4.5–5.7) × 109[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HR 4523 is a binary star system that is located in the constellation of Centaurus. The larger member of the system is a G-type star that is smaller than the Sun but of similar mass. It is orbited by a faint M-type star at an average separation of about 235 Astronomical Units (A.U.), (or 235 times the separation of the Earth from the Sun). By comparison, Neptune orbits at an average distance of 30 A.U.
This star is believed to be orbited by a Neptune-like planet with a mass 16 times that of the Earth. The orbital period of this planet is 122.1 days. No other planets have been discovered orbiting this star.[4] It is a member of the Epsilon Indi Moving Group, although it is most likely an interloper. (The star is older and has a different composition than the other group members.)[1]
References
- ^ a b Kovacs, N.; Foy, R. (1978). "A detailed analysis of three stars in the Eggen's Epsilon INDI moving group". Astronomy and Astrophysics. 68 (1–2): 27–31. Retrieved 2007-02-04.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ a b c Porto de Mello, G.; del Peloso, E. F.; Ghezzi, L. (2006). "Astrobiologically Interesting Stars Within 10 Parsecs of the Sun". Astrobiology. 6 (2): 308–331. doi:10.1089/ast.2006.6.308. PMID 16689649. Retrieved 2007-05-25.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal. 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785.
{{cite journal}}: Unknown parameter|month=ignored (help)CS1 maint: multiple names: authors list (link) - ^ Tinney, C. G. (2011). "The Anglo-Australian Planet Search. XX. A Solitary Ice-giant Planet Orbiting HD 102365". The Astrophysical Journal. 727: 103. doi:10.1088/0004-637X/727/2/103.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help)
External links
- "HR 4523 AB". SolStation. Retrieved 2007-05-25.