HD 1185

HD 1185
Observation data; Epoch J2000 Equinox J2000
Constellation	Andromeda
	A
Right ascension	00h 16m 21.52890s
Declination	+43° 35′ 42.1834″
Apparent magnitude (V)	6.150
	B
Right ascension	00h 16m 22.33562s
Declination	+43° 35′ 44.5452″
Apparent magnitude (V)	9.76
Characteristics
A
Evolutionary stage	main sequence
Spectral type	A2VpSi
U−B color index	0.03
B−V color index	0.05
Astrometry
A
Radial velocity (Rv)	3.00±2.60 km/s
Proper motion (μ)	RA: +35.421 mas/yr ; Dec.: −23.037 mas/yr
Parallax (π)	10.2349±0.0329 mas
Distance	319 ± 1 ly ; (97.7 ± 0.3 pc)
B
Radial velocity (Rv)	4.48±0.22 km/s
Proper motion (μ)	RA: +34.310 mas/yr ; Dec.: −21.927 mas/yr
Parallax (π)	10.1971±0.0157 mas
Distance	319.9 ± 0.5 ly ; (98.1 ± 0.2 pc)
Details
A
Mass	2.4 M☉
Radius	2.1 R☉
Luminosity	38 L☉
Surface gravity (log g)	4.02 cgs
Temperature	9,103 K
Metallicity [Fe/H]	−0.11 dex
Rotational velocity (v sin i)	128 km/s
Age	311 Myr
B
Mass	1.0 M☉
Radius	0.90 R☉
Luminosity	0.76 L☉
Surface gravity (log g)	4.50 cgs
Temperature	5,712 K
Metallicity [Fe/H]	−0.26 dex
Age	224 Myr
Other designations
	BD+42°41, HD 1185, HIP 1302, HR 56, SAO 36221, WDS 00164+4336
Database references
SIMBAD	data

HD 1185 is a double star^[12] in the northern constellation of Andromeda. The primary, with an apparent magnitude of 6.15, is a white main-sequence star of spectral type A2VpSi,^[6] indicating it has stronger silicon absorption lines than usual, thus making it also an Ap star.^[7] The secondary companion, which is 9.08 arcseconds away, is not visible to the naked eye at an apparent magnitude of 9.76. It shares common proper motion and parallax with the primary star^[11] but orbital parameters are still unknown.

Apparentmagnitude(V)6.150^[3]

Apparentmagnitude(V)9.76^[5]

Evolutionarystagemain sequence^[2]

SpectraltypeA2VpSi^[6]

Quick facts Observation data Epoch J2000 Equinox J2000, Apparent magnitude (V) ...

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Observation data Epoch J2000 Equinox J2000
Constellation	Andromeda^[1]
A
Right ascension	00^h 16^m 21.52890^s^[2]
Declination	+43° 35′ 42.1834″^[2]
Apparent magnitude (V)	6.150^[3]
B
Right ascension	00^h 16^m 22.33562^s^[4]
Declination	+43° 35′ 44.5452″^[4]
Apparent magnitude (V)	9.76^[5]
Characteristics
A
Evolutionary stage	main sequence^[2]
Spectral type	A2VpSi^[6]
U−B color index	0.03^[7]
B−V color index	0.05^[7]
Astrometry
A
Radial velocity (R_v)	3.00±2.60^[8] km/s
Proper motion (μ)	RA: +35.421^[2] mas/yr Dec.: −23.037^[2] mas/yr
Parallax (π)	10.2349±0.0329 mas^[2]
Distance	319 ± 1 ly (97.7 ± 0.3 pc)
B
Radial velocity (R_v)	4.48±0.22^[4] km/s
Proper motion (μ)	RA: +34.310^[4] mas/yr Dec.: −21.927^[4] mas/yr
Parallax (π)	10.1971±0.0157 mas^[4]
Distance	319.9 ± 0.5 ly (98.1 ± 0.2 pc)
Details
A
Mass	2.4^[2] `M`_☉
Radius	2.1^[2] `R`_☉
Luminosity	38^[2] `L`_☉
Surface gravity (log g)	4.02^[2] cgs
Temperature	9,103^[9] K
Metallicity [Fe/H]	−0.11^[9] dex
Rotational velocity (v sin i)	128^[10] km/s
Age	311^[2] Myr
B
Mass	1.0^[4] `M`_☉
Radius	0.90^[4] `R`_☉
Luminosity	0.76^[4] `L`_☉
Surface gravity (log g)	4.50^[4] cgs
Temperature	5,712^[9] K
Metallicity [Fe/H]	−0.26^[9] dex
Age	224^[4] Myr
Other designations
BD+42°41, HD 1185, HIP 1302, HR 56, SAO 36221, WDS 00164+4336^[11]
Database references
SIMBAD	data

HD 1185

References

External links

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