Region around γ Cygni, with RW Cygni annotated on the full-size image (north is right)
Observation data Epoch J2000 Equinox J2000
Constellation
Cygnus
Right ascension
20h 28m 50.59027s[1]
Declination
39° 58′ 54.4180″[1]
Apparent magnitude (V)
8.05 - 9.70[2]
Characteristics
Evolutionary stage
Red supergiant
Spectral type
M3-4Ia-Iab[3]
Variable type
SRc[2]
Astrometry
Radial velocity (Rv)
−18.39±0.52[1] km/s
Proper motion (μ)
RA: –3.255[1] mas/yr Dec.: –5.511[1] mas/yr
Parallax (π)
0.4602 ± 0.0897 mas[1]
Distance
1,620±40[4] pc
Absolute magnitude (MV)
–6.41[5]
Details
Radius
1103+251 −177[6]R☉
Luminosity
126,000[4]L☉
Temperature
3,600[7] K
Other designations
RW Cyg, BD+39 4208, HIP 101023, IRAS 20270+3948, 2MASS J20285059+3958543
Database references
SIMBAD
data
RW Cygni is a semiregular variable star in the constellation Cygnus, about a degree east of 2nd magnitude γ Cygni. Its apparent magnitude varies between 8.05 and 9.70 and its spectral type between M3 and M4.
^ abcdefBrown, 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.
^ abSamus, 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.
^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.
^ abDavies, Ben; Beasor, Emma R. (March 2020). "The 'red supergiant problem': the upper luminosity boundary of Type II supernova progenitors". MNRAS. 493 (1): 468–476. arXiv:2001.06020. Bibcode:2020MNRAS.493..468D. doi:10.1093/mnras/staa174. S2CID 210714093.
^Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901. S2CID 15109583.
^Norris, Ryan (2021-03-01). An Interferometric Imaging Survey of Red Supergiant Stars. Bibcode:2021csss.confE.263N. doi:10.5281/zenodo.4567641.
^Norris, Ryan P. (2019). Seeing Stars Like Never Before: A Long-term Interferometric Imaging Survey of Red Supergiants(PDF) (PhD). Georgia State University.
RWCygni is a semiregular variable star in the constellation Cygnus, about a degree east of 2nd magnitude γ Cygni. Its apparent magnitude varies between...
Cepheus RWCygni, a red supergiant located in the constellation Cygnus RW Leonis Minoris, a carbon star located in the constellation Leo Minor RW Ursae...
consisting of Epsilon Cygni, Gamma Cygni, Delta Cygni, 30 Cygni, Alpha Cygni, Nu Cygni, Tau Cygni, Upsilon Cygni and Zeta Cygni. Consequently, the Chinese...
Bayer designation is α Cygni, which is Latinised to Alpha Cygni, abbreviated to Alpha Cyg or α Cyg. α Cygni (Latinised to Alpha Cygni) is the star's designation...
is the only one mentioned in the paper. 6 Geminorum BI Cygni NR Vulpeculae RS Persei RWCygni S Persei TV Geminorum V424 Lacertae List of largest known...
61 Cygni /ˈsɪɡni/ is a binary star system in the constellation Cygnus, consisting of a pair of K-type dwarf stars that orbit each other in a period of...
Albireo /ælˈbɪrioʊ/ is a double star designated Beta Cygni (β Cygni, abbreviated Beta Cyg, β Cyg). The International Astronomical Union uses the name "Albireo"...
it took 12 million years to enter the red supergiant phase. RWCygni KY Cygni NML Cygni Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data...
431..773R. doi:10.1051/0004-6361:20042039. ISSN 0004-6361. Data about NML Cygni (IRC +40448) is found here at VizieR. Zhang, B.; Reid, M. J.; Menten, K...
to have increased its average brightness of 0.5 magnitudes. NML Cygni KY CygniRWCygni Applying the Stefan–Boltzmann law with a nominal solar effective...
V1974 Cygni or Nova Cygni 1992 was a nova, visible to the naked eye, in the constellation Cygnus. It was discovered visually with 10×50 binoculars on...
16 Cygni A and 16 Cygni B, together with a red dwarf, 16 Cygni C. In 1996 an extrasolar planet was discovered in an eccentric orbit around 16 Cygni B....
P Cygni (34 Cygni) is a variable star in the constellation Cygnus. The designation "P" was originally assigned by Johann Bayer in Uranometria as a nova...
consisting of Gamma Cygni, Delta Cygni, 30 Cygni, Alpha Cygni, Nu Cygni, Tau Cygni, Upsilon Cygni, Zeta Cygni and Epsilon Cygni. Consequently, the Chinese...
NML Cygni or V1489 Cygni (abbreviated to NML Cyg or V1489 Cyg) is a red hypergiant or red supergiant (RSG) in the constellation Cygnus. It is possibly...
Region (also known as IC 1318 or the Gamma Cygni Nebula) is the diffuse emission nebula surrounding Sadr (γ Cygni) at the center of Cygnus's cross. The Sadr...
Omega2 Cygni, Latinized from ω2 Cygni, is the Bayer designation for a solitary star in the northern constellation of Cygnus. It has an apparent visual...
Delta Cygni (δ Cygni, abbreviated Delta Cyg, δ Cyg) is a binary star of a combined third-magnitude in the constellation of Cygnus. It is also part of the...
Mu Cephei VV Cephei A NML CygniRW Cephei S Persei VY Canis Majoris - potentially the largest star in the Milky Way KY Cygni PZ Cassiopeiae HD 143183 UY...
KY Cygni is a red supergiant of spectral class M3.5Ia located in the constellation Cygnus. It is approximately 4,700 light-years away. KY Cyg lies near...
V1331 Cygni (also known as V1331 Cyg) is a young star in the constellation Cygnus. V1331 Cyg is located in the dark nebula LDN 981. V1331 Cygni is most...
classified as an Algol type eclipsing variable and given the designation V1769 Cygni, but the variation is not strictly periodic and brightness changes occur...
μ Cygni, Latinised as Mu Cygni, is a binary star system in the northern constellation of Cygnus. It is visible to the naked eye as a faint point of light...
Kappa Cygni, Latinized from κ Cygni, is a star in the northern constellation of Cygnus. It has an apparent visual magnitude of 3.8, which is bright enough...
V1334 Cygni, also referred to as ADS 14859 and HR 8157 in astronomical literature, is a star about 2350±25 light years from the Earth in the constellation...
X Cygni is a variable star in the northern constellation of Cygnus, abbreviated X Cyg. This is a Delta Cephei variable that ranges in brightness from...
OB stars, along with supergiant stars, like the red supergiant RWCygni. Gamma Cygni is a foreground star, lying at a distance of approximately 1,500...
V389 Cygni, also known as HD 201433 and HR 8094, is a star about 390 light years from the Earth, in the constellation Cygnus. It is a 5th-magnitude star...
Y Cygni is an eclipsing and double-lined spectroscopic binary star system in the constellation of Cygnus. It is located about 4,900 light-years from Earth...
Global Information