B1 Hydrae

b¹ Hydrae
Observation data; Epoch J2000.0 Equinox ICRS
Constellation	Hydra
Right ascension	10h 46m 52.05s
Declination	−17° 17′ 48.7″
Apparent magnitude (V)	5.42
Characteristics
Evolutionary stage	main sequence
Spectral type	A3V
U−B color index	+0.14
B−V color index	+0.11
R−I color index	+0.04
Astrometry
Radial velocity (Rv)	+0.23±0.99 km/s
Proper motion (μ)	RA: −15.864 mas/yr ; Dec.: −18.786 mas/yr
Parallax (π)	17.7995±0.1794 mas
Distance	183 ± 2 ly ; (56.2 ± 0.6 pc)
Absolute magnitude (MV)	+1.45
Details
Mass	2.09 M☉
Radius	1.94 R☉
Luminosity	17.2 L☉
Surface gravity (log g)	4.18 cgs
Temperature	8,433 K
Rotational velocity (v sin i)	96 km/s
Age	652 Myr
Other designations
	3 Crt, BD−16°3124, HD 93397, HR 4214, SAO 156221
Database references
SIMBAD	data

b¹ Hydrae is a main-sequence star in the constellation of Hydra with an apparent magnitude of 5.42.

Right ascension10^h 46^m 52.05^s^[2]

Declination−17° 17′ 48.7″^[2]

Quick facts Constellation, Right ascension ...

Close

Observation data Epoch J2000.0 Equinox ICRS
Constellation	Hydra^[1]
Right ascension	10^h 46^m 52.05^s^[2]
Declination	−17° 17′ 48.7″^[2]
Apparent magnitude (V)	5.42^[3]
Characteristics
Evolutionary stage	main sequence^[4]
Spectral type	A3V^[3]
U−B color index	+0.14^[3]
B−V color index	+0.11^[3]
R−I color index	+0.04^[3]
Astrometry
Radial velocity (R_v)	+0.23±0.99^[2] km/s
Proper motion (μ)	RA: −15.864^[2] mas/yr Dec.: −18.786^[2] mas/yr
Parallax (π)	17.7995±0.1794 mas^[2]
Distance	183 ± 2 ly (56.2 ± 0.6 pc)
Absolute magnitude (M_V)	+1.45^[5]
Details
Mass	2.09^[6] `M`_☉
Radius	1.94^[6] R_☉
Luminosity	17.2^[6] `L`_☉
Surface gravity (log g)	4.18^[6] cgs
Temperature	8,433^[6] K
Rotational velocity (v sin i)	96^[4] km/s
Age	652^[7] Myr
Other designations
3 Crt, BD−16°3124, HD 93397, HR 4214, SAO 156221^[8]
Database references
SIMBAD	data

References