30 Cygni

30 Cygni
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	20h 13m 18.05358s
Declination	46° 48′ 56.4424″
Apparent magnitude (V)	4.83 (4.81 - 4.84)
Characteristics
Spectral type	A5IIIn
U−B color index	+0.17
B−V color index	+0.10
Variable type	suspected
Astrometry
Radial velocity (Rv)	-26.00 km/s
Proper motion (μ)	RA: +13.83 mas/yr ; Dec.: +3.00 mas/yr
Parallax (π)	5.34 ± 0.33 mas
Distance	610 ± 40 ly ; (190 ± 10 pc)
Details
Radius	1.40 R☉
Luminosity	323.56 L☉
Temperature	7,712 K
Rotational velocity (v sin i)	145 km/s
Other designations
	ο1 Cygni, BD+46° 2881, GC 28091, HIP 99639, HR 7730, HD 192514, SAO 49332, WDS J20136+4644D, CCDM J20135+4646D
Database references
SIMBAD	data

30 Cygni (ο¹ Cygni) is a class A5III (white giant) star in the constellation Cygnus. Its apparent magnitude is 4.83 and it is approximately 610 light years away based on parallax.

The Bayer letter ο (omicron) has been variously applied to two or three of the stars 30, 31, and 32 Cygni. 30 Cygni has sometimes been designated as ο¹ Cygni with the other two stars being ο² and ο³ respectively. For clarity, it is preferred to use the Flamsteed designation 30 Cygni rather than one of the Bayer designations.^[9]

30 Cygni is about six arc-minutes from 31 Cygni A and seven arc-minutes from 31 Cygni B. That pair is known as ο¹ Cygni, while ο² Cygni is a degree away. Both ο¹ and ο² are 4th magnitude stars.

References

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Observation data Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	20^h 13^m 18.05358^s^[1]
Declination	46° 48′ 56.4424″^[1]
Apparent magnitude (V)	4.83^[2] (4.81 - 4.84^[3])
Characteristics
Spectral type	A5IIIn^[4]
U−B color index	+0.17^[2]
B−V color index	+0.10^[2]
Variable type	suspected^[3]
Astrometry

Radial velocity (R_v)	-26.00^[5] km/s
Proper motion (μ)	RA: +13.83^[1] mas/yr Dec.: +3.00^[1] mas/yr
Parallax (π)	5.34 ± 0.33 mas^[1]
Distance	610 ± 40 ly (190 ± 10 pc)

Details

Radius	1.40^[6] `R`_☉
Luminosity	323.56^[7] `L`_☉
Temperature	7,712^[7] K
Rotational velocity (v sin i)	145^[8] km/s

Other designations
ο¹ Cygni,^[9] BD+46° 2881, GC 28091, HIP 99639, HR 7730, HD 192514, SAO 49332, WDS J20136+4644D, CCDM J20135+4646D
Database references
SIMBAD	data