Astronomy:HD 122862
From HandWiki
Short description: Star in the constellation of Apus
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Apus |
| Right ascension | 14h 08m 27.1634s[1] |
| Declination | −74° 51′ 01.0329″[1] |
| Apparent magnitude (V) | 6.02[2] |
| Characteristics | |
| Spectral type | G2/3 IV[3] |
| U−B color index | +0.06[4] |
| B−V color index | +0.58[4] |
| Astrometry | |
| Radial velocity (Rv) | −21.11±0.16[5] km/s |
| Proper motion (μ) | RA: −243.574[1] mas/yr Dec.: +179.540[1] mas/yr |
| Parallax (π) | 34.1491 ± 0.0256[1] mas |
| Distance | 95.51 ± 0.07 ly (29.28 ± 0.02 pc) |
| Absolute magnitude (MV) | +3.75[2] |
| Details[6] | |
| Mass | 1.08+0.02−0.01 M☉ |
| Radius | 1.58+0.03−0.05[5] R☉ |
| Luminosity | 2.87±0.01[5] L☉ |
| Surface gravity (log g) | 4.10±0.03 cgs |
| Temperature | 5,943±50 K |
| Metallicity [Fe/H] | −0.15±0.04 dex |
| Rotational velocity (v sin i) | 3.1±1[7] km/s |
| Age | 6.83+0.39−0.57 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 122862 (HR 5279) is a solitary star in the southern circumpolar constellation Apus. It has an apparent magnitude of 6.02,[2] allowing it to be faintly seen with the naked eye under ideal conditions. The star is relatively close at a distance of 95 light years,[1] but is approaching the Sun with a radial velocity of −21.11 km/s.[5]
HD 122862 is a G-type subgiant[3] with 1.08 times the mass of the Sun[6] and a diameter of 1.58 R☉.[5] It shines at 2.87 times the luminosity of the Sun[5] from its photosphere at an effective temperature of 5,943 K,[6] giving it a yellow glow. HD 122862 has an iron abundance 71% that of the Sun[6] and, at an age of 6.83 billion years,[6] it spins slowly with a projected rotational velocity of 3.1 km/s.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0.. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 6.0 6.1 6.2 6.3 6.4 Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy and Astrophysics 614: A55. doi:10.1051/0004-6361/201732209. ISSN 0004-6361. Bibcode: 2018A&A...614A..55A.
- ↑ 7.0 7.1 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. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
 |  |
