4 Cygni
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 26m 09.12723s |
| Declination | +36° 19' 04.43" |
| Characteristics | |
| Spectral type | B9sp I |
| U−B color index | -0.43 |
| B−V color index | -0.12 |
| Variable type | α2 CVn[2] |
| Astrometry | |
| Radial velocity (Rv) | -22 km/s |
| Proper motion (μ) | RA: 4.60 mas/yr Dec.: 13.58 mas/yr |
| Parallax (π) | 4.61 ± 0.62 mas |
| Distance | approx. 710 ly (approx. 220 pc) |
| Other designations | |
4 Cygni (4 Cyg) is a star in the constellation Cygnus, approximately 710 light years away from Earth.[1]
References
- ^ a b "Simbad Query Result". Simbad. Retrieved March 4, 2014.
- ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
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