30 Cygni

30 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 13m 18.05358s[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 (Rv)-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]
Distance610 ± 40 ly
(190 ± 10 pc)
Details
Radius1.40[6] R☉
Luminosity323.56[7] L☉
Temperature7,712[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
SIMBADdata
30 Cygni at top left, with 31 Cygni A and B at lower right

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.

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference ubv was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Jaschek1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Kharchenko2007 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Cadars was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference mcdonald was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference vanbelle was invoked but never defined (see the help page).
  9. ^ a b Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.