2 Equulei

2 Equulei
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Equuleus
A
Right ascension 21h 02m 12.50262s[1]
Declination +07° 10′ 47.1545″[1]
Apparent magnitude (V) 7.41[2]
B
Right ascension 21h 02m 12.39375s[3]
Declination +07° 10′ 44.7957″[3]
Apparent magnitude (V) 7.64[2]
Characteristics
A
Evolutionary stage subgiant[1]
Spectral type F6V[4]
B
Evolutionary stage subgiant[3]
Spectral type F3V[5]
Astrometry
Radial velocity (Rv)−4.8±1.6[6] km/s
Absolute magnitude (MV)2.16±0.18[7]
A
Proper motion (μ) RA: −9.184[1] mas/yr
Dec.: −12.915[1] mas/yr
Parallax (π)8.8125±0.2481 mas[1]
Distance370 ± 10 ly
(113 ± 3 pc)
B
Proper motion (μ) RA: −4.238[3] mas/yr
Dec.: −17.934[3] mas/yr
Parallax (π)8.5577±0.0298 mas[3]
Distance381 ± 1 ly
(116.9 ± 0.4 pc)
Details
2 Equ A
Mass1.73[6] M☉
Radius2.6[1] R☉
Luminosity12.9[1] L☉
Surface gravity (log g)3.84[1] cgs
Temperature6,127[1] K
Metallicity [Fe/H]0.17[6] dex
Age1.9[1] Gyr
2 Equ B
Mass1.61[3] M☉
Radius2.8[3] R☉
Luminosity10.9[3] L☉
Surface gravity (log g)3.72[3] cgs
Temperature6,420[3] K
Age2.2[3] Gyr
Other designations
λ Equ, 2 Equulei, BD+06°4731, HD 200256, HIP 103813, LTT 16227, SAO 126482[8]
Database references
SIMBADdata

2 Equulei is a double star system in the constellation of Equuleus.

The primary component of the 2 Equulei pair is an F-type star. As of 2015, the secondary had an angular separation of 2.90 arc seconds along a position angle of 213° from the primary.[2] They form a common proper motion pair, two stars at approximately the same distance and moving in the same direction.[4] Gaia DR3 gives them parallaxes of 8.8125±0.2471 mas and 8.5577±0.0298 mas respectively, although they are flagged as potentially unreliable.[1][3] These parallaxes correspond to a distance of around 380 ly, in contrast to the Hipparcos distance of 260±20 ly for the two stars as a pair.[9]

2 Equulei has been referred to in some sources as λ (Lambda) Equulei, although it was not given that designation by Bayer.[10]

References

  1. ^ a b c d e f g h i j k l Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
  3. ^ a b c d e f g h i j k l m Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. ^ a b Abt, Helmut A. (2008). "Visual Multiples. IX. MK Spectral Types". The Astrophysical Journal Supplement Series. 176 (1): 216–217. Bibcode:2008ApJS..176..216A. doi:10.1086/525529.
  5. ^ Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal. 81: 187. Bibcode:1935ApJ....81..187A. doi:10.1086/143628.
  6. ^ a b c Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  7. ^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
  8. ^ "2 Equ -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-02-17.
  9. ^ 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.
  10. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 215. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.

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