HD 1

Coordinates: Sky map 00h 05m 08.84054s, +67° 50′ 23.9805″
Source: Wikipedia, the free encyclopedia.
This article is about a star in the Henry Draper Catalogue. For other uses, see HD 1 (disambiguation).
HD 1
Observation data
J2000.0
Constellation Cepheus
Right ascension 00h 05m 08.84054s[1]
Declination +67° 50′ 23.9805″[1]
Apparent magnitude (V) 7.42±0.01[2]
Characteristics
Evolutionary stage
red giant branch[1][3]
Spectral type G9-K0 IIIa[3]
Distance
1,220 ± 20 ly
(375 ± 7 pc)
Absolute magnitude (MV)−0.01[5]
Semi-amplitude
(K1)
(primary)		4.35±0.08 km/s
Details
Myr
HIP 422, SAO 10963, GSC 04294-00080[10]
Database references
SIMBADdata

HD 1, also known as HIP 422, is the first star catalogued in the

spectroscopic radial velocity of −27.3 km/s.[4]

Characteristics

Originally thought to be a single object, observations from Griffin & McClure (2009) reveal it to be a single-lined

projected rotational velocity of 5.6 km/s.[3]

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    ISSN 0004-6361
    .
  3. ^
    ISSN 0004-6337
    .
  4. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  5. S2CID 119257644
    .
  6. ^
    ISSN 0029-7704
    .
  7. ^
    ISSN 0004-6361
    .
  8. ^
    ISSN 0004-6361
    .
  9. ^
    eISSN 1538-3881
    .
  10. ^ "HD 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 September 2022.
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