| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 40m 11.10795s [1] |
| Declination | +43° 16′ 25.8161″ [1] |
| Apparent magnitude (V) | 5.09 [2] |
| Characteristics | |
| Evolutionary stage | red giant |
| Spectral type | M1IIIab [3] |
| B−V color index | 1.601±0.006 [2] |
| Variable type | suspected [4] |
| Astrometry | |
| Radial velocity (Rv) | −29.25±0.14 [1] km/s |
| Proper motion (μ) |
RA: +62.366
[1]
mas/
yr Dec.: +15.488 [1] mas/ yr |
| Parallax (π) | 7.5210 ± 0.1706 mas [1] |
| Distance | 434 ± 10
ly (133 ± 3 pc) |
| Absolute magnitude (MV) | −0.36 [2] |
| Details | |
| Radius | 44.61+3.12 −7.77 [1] R☉ |
| Luminosity | 438.5±11.5 [1] L☉ |
| Temperature | 3,954+397 −131 [1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
75 Cygni is a binary star [6] system in the northern constellation of Cygnus. It is visible to the naked eye as a dim, reddish-hued point of light with an apparent visual magnitude of 5.09. [2] The system is located at a distance of about 434 light years from the Sun, based on parallax, and is drifting closer with a radial velocity of −29 km/s. [1]
The pair had an angular separation of 2.7 ″ as of 2008, with the companion having a visual magnitude of 10.7. [6] The brighter magnitude 5.18 [6] primary is an aging red giant star with a stellar classification of M1IIIab. [3] Having exhausted the supply of hydrogen at its core, it has expanded to around 45 [1] times the radius of the Sun. It is a suspected variable star of unknown type and amplitude. [4] The star is radiating 439 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,954 K. [1]
An optical companion, with a spectral type of K, is about an arcminute away and has an apparent magnitude of 10.14. [7]
- ^ a b c d e f g h i j k l m Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode: 1989ApJS...71..245K, doi: 10.1086/191373, S2CID 123149047.
- ^ a b Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, GCVS 5.1, 61 (1): 80–88, Bibcode: 2017ARep...61...80S, doi: 10.1134/S1063772917010085, S2CID 125853869.
- ^ "75 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
- ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ "BD+42 4177C". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 40m 11.10795s [1] |
| Declination | +43° 16′ 25.8161″ [1] |
| Apparent magnitude (V) | 5.09 [2] |
| Characteristics | |
| Evolutionary stage | red giant |
| Spectral type | M1IIIab [3] |
| B−V color index | 1.601±0.006 [2] |
| Variable type | suspected [4] |
| Astrometry | |
| Radial velocity (Rv) | −29.25±0.14 [1] km/s |
| Proper motion (μ) |
RA: +62.366
[1]
mas/
yr Dec.: +15.488 [1] mas/ yr |
| Parallax (π) | 7.5210 ± 0.1706 mas [1] |
| Distance | 434 ± 10
ly (133 ± 3 pc) |
| Absolute magnitude (MV) | −0.36 [2] |
| Details | |
| Radius | 44.61+3.12 −7.77 [1] R☉ |
| Luminosity | 438.5±11.5 [1] L☉ |
| Temperature | 3,954+397 −131 [1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
75 Cygni is a binary star [6] system in the northern constellation of Cygnus. It is visible to the naked eye as a dim, reddish-hued point of light with an apparent visual magnitude of 5.09. [2] The system is located at a distance of about 434 light years from the Sun, based on parallax, and is drifting closer with a radial velocity of −29 km/s. [1]
The pair had an angular separation of 2.7 ″ as of 2008, with the companion having a visual magnitude of 10.7. [6] The brighter magnitude 5.18 [6] primary is an aging red giant star with a stellar classification of M1IIIab. [3] Having exhausted the supply of hydrogen at its core, it has expanded to around 45 [1] times the radius of the Sun. It is a suspected variable star of unknown type and amplitude. [4] The star is radiating 439 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,954 K. [1]
An optical companion, with a spectral type of K, is about an arcminute away and has an apparent magnitude of 10.14. [7]
- ^ a b c d e f g h i j k l m Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971, Bibcode: 2012AstL...38..331A, doi: 10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode: 1989ApJS...71..245K, doi: 10.1086/191373, S2CID 123149047.
- ^ a b Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, GCVS 5.1, 61 (1): 80–88, Bibcode: 2017ARep...61...80S, doi: 10.1134/S1063772917010085, S2CID 125853869.
- ^ "75 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
- ^ a b c Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ "BD+42 4177C". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.