HD 4778

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HD 4778
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 50m 18.26s[1]
Declination +45° 00′ 08.1″[1]
Apparent magnitude (V) 6.125
Characteristics
Spectral type A0p
U−B color index –0.03
B−V color index 0.01
Variable type α2 CVn
Astrometry
Radial velocity (Rv)1.60[2] km/s
Proper motion (μ) RA: 61.50 ± 0.53[1] mas/yr
Dec.: 7.00 ± 0.45[1] mas/yr
Parallax (π)9.97 ± 0.68 mas[1]
Distance330 ± 20 ly
(100 ± 7 pc)
Absolute magnitude (MV)1.18[3]
Details
Mass2.24 ± 0.09[3] M☉
Radius2.2 ± 0.2[3] R☉
Luminosity32[3] L☉
Surface gravity (log g)4.12 ± 0.09[3] cgs
Temperature9,375[3] K
Rotation2.5616 days[3]
Other designations
GO Andromedae, BD+44° 176, HD 4778, SAO 36702, FK5 2055, HIP 3919, HR 234.
Database references
SIMBADdata

HD 4778, also known as HR 234, is an Alpha2 Canum Venaticorum variable in the constellation Andromeda. Its magnitude varies by 0.04 magnitudes from the median of 6.12 with a period of approximately 2.55 days.[4]

References

  1. ^ a b c d e 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. Vizier catalog entry
  2. ^ Kharchenko, N. V.; Scholz, R. -D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ∼55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
  3. ^ a b c d e f g North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N
  4. ^ VSX (4 January 2010). "GO Andromedae". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 May 2014.
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