1 Aurigae

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1 Aurigae
Observation data
Epoch J2000.0 (ICRS)      Equinox J2000.0 (ICRS)
Constellation Perseus
Right ascension 04h 49m 54.6383s
Declination +37° 29′ 17.789″
Apparent magnitude (V) 4.88
Spectral type K3.5IIIBa0.2:
U−B color index 1.70
B−V color index 1.44
Variable type none
Radial velocity (Rv) -23 km/s
(suspected variable)
Parallax (π) 6.18 ± 0.84 mas
Distance 520 ± 80 ly
160 ± 25 pc
Absolute magnitude (MV) -1.2
Other designations
1 Aur, HR 1533, HD 30504, SAO 57447
Data sources:
Hipparcos Catalogue,
Bright Star Catalogue (5th rev. ed.)

1 Aurigae is the original name for a star now in the constellation Perseus. It was the first entry in John Flamsteed's catalogue of stars in Auriga. When Eugène Joseph Delporte drew up simplified boundaries for the constellations on behalf of the International Astronomical Union in 1930, 1 Aurigae ended up over the border in Perseus. To avoid confusion, the star is now generally known by its Harvard Revised catalogue number, HR 1533.

It is an orange K-type giant with an apparent magnitude of +4.88 and lies approximately 520 light years from Earth.


1 Aurigae in SIMBAD