HD 4778

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HD 4778

A light curve for GO Andromedae, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 50m 18.26563s[2]
Declination +45° 00′ 08.1439″[2]
Apparent magnitude (V) 6.13[3]
Characteristics
Spectral type A3VpSiSrCrEuKsn[4]
B−V color index 0.043±0.004[3]
Variable type α2 CVn[5]
Distance
350 ± 3 ly
(107 ± 1 pc)
Absolute magnitude (MV)1.18[7]
Details
Myr
PPM 43369[10]
Database references
SIMBADdata

HD 4778, also known as HR 234 and GO Andromedae, is a

mas.[2]

This is an

spectrum from strontium, chromium, and europium.[12] It is an Alpha2 Canum Venaticorum variable[5] with a magnetic field that varies across the range +1,400 to −1,100 G.[13] This rotation-modulated variability allows direct determination of the rotation rate of 2.5616 days.[7]

HD 4778 has 2.24

Sun's luminosity from its photosphere at an effective temperature of 9,375 K.[7] It is about 77[9]
 million years old.

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^
    doi:10.1051/0004-6361/201833051
    .
  3. ^
    S2CID 119257644
    .
  4. ^
    doi:10.1086/192182
    .
  5. ^
    S2CID 125853869
    .
  6. S2CID 119323941
    .
  7. ^
    Bibcode:1998A&A...334..181N
  8. ^
    doi:10.1051/0004-6361/202038753
    , A101.
  9. ^
    S2CID 33401607
    .
  10. ^ "HD 3167". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 6, 2018.
  11. ^ VSX (4 January 2010). "GO Andromedae". AAVSO Website. American Association of Variable Star Observers. Retrieved 25 May 2014.
  12. Bibcode:1980A&A....90..341P
    .
  13. Bibcode:1989A&A...220..215B
    .
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