astro.wikisort.org - Star42 Aquarii is a single[8] star located 447 light years away from the Sun in the zodiac constellation of Aquarius. 42 Aquarii is its Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.34.[2] This object is moving further from the Sun with a heliocentric radial velocity of around +13 km/s.[2]
Star in the constellation Aquarius
42 Aquarii
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
Constellation |
Aquarius |
Right ascension |
22h 16m 48.04643s[1] |
Declination |
−12° 49′ 53.1673″[1] |
Apparent magnitude (V) |
5.34[2] |
Characteristics |
Evolutionary stage |
giant |
Spectral type |
K1 III[3] |
B−V color index |
1.132±0.001[2] |
Astrometry |
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Radial velocity (Rv) | +13.0±4.2[2] km/s |
Proper motion (μ) | RA: +1.89[4] mas/yr Dec.: +5.03[4] mas/yr |
Parallax (π) | 7.3032 ± 0.1451 mas[1] |
Distance | 447 ± 9 ly (137 ± 3 pc) |
Absolute magnitude (MV) | −0.93[2] |
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Details |
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Mass | 3.14±0.27[5] M☉ |
Radius | 11.24+0.23 −0.32[1] R☉ |
Luminosity | 69.950±3.907[1] L☉ |
Surface gravity (log g) | 2.90[6] cgs |
Temperature | 4,980+71 −51[1] K |
Metallicity [Fe/H] | +0.00±0.04[2] dex |
Rotational velocity (v sin i) | 3.43[6] km/s |
Age | 470±150[5] Myr |
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Other designations |
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Database references |
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SIMBAD | data |
This object is an evolved giant star with a stellar classification of K1 III,[3] most likely (82% chance) on the horizontal branch.[5] It is around 470[5] million years old with a projected rotational velocity of 3.4 km/s.[6] The star has over three[5] times the mass of the Sun and has expanded to 11[1] times the Sun's radius. It is radiating 70[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,980 K.[1]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics, 574: A116, arXiv:1412.4634, Bibcode:2015A&A...574A.116R, doi:10.1051/0004-6361/201322360, hdl:10722/215277, S2CID 59334290.
- Hekker, S.; Meléndez, J. (2007), "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters", Astronomy and Astrophysics, 475 (3): 1003, arXiv:0709.1145, Bibcode:2007A&A...475.1003H, doi:10.1051/0004-6361:20078233, S2CID 10436552.
- "42 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-16.
- Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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На других языках
[de] 42 Aquarii
42 Aquarii (42 Aqr) ist ein Stern im Sternbild Wassermann (lat. Aquarius), der eine Entfernung von etwa 600 Lichtjahren zur Sonne besitzt. Er gehört der Spektralklasse K1 an und hat eine scheinbare Helligkeit von 5,3 mag.
- [en] 42 Aquarii
[ru] 42 Водолея
42 Водолея (лат. 42 Aquarii), HD 211361 — одиночная звезда в созвездии Водолея на расстоянии приблизительно 447 световых лет (около 137 парсеков) от Солнца. Видимая звёздная величина звезды — +5,333m[2]. Возраст звезды оценивается как около 470 млн лет[5].
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