44 Cygni

44 Cygni
Location of 44 Cygni (circled)
Observation data
Epoch 2000.0      Equinox ICRS
Constellation Cygnus
A
Right ascension 20h 30m 59.23s
Declination +36° 56′ 09.0″
Apparent magnitude (V) 6.22
B
Right ascension 20h 30m 59.30s
Declination +36° 56′ 07.0″
Apparent magnitude (V) 10.07
Characteristics
Spectral type F5Ib
Astrometry
Radial velocity (Rv)−19.91±0.14 km/s
Proper motion (μ) RA: −0.623 mas/yr
Dec.: −3.894 mas/yr
Parallax (π)0.7690±0.0215 mas
Distance4,200 ± 100 ly
(1,300 ± 40 pc)
Absolute magnitude (MV)−6.51
Details
A
Mass11.2 M☉
Radius74 R☉
Luminosity9,151 L☉
Surface gravity (log g)1.44 cgs
Temperature6,554 K
Rotational velocity (v sin i)6.5 km/s
Age18 Myr
B
Mass1.6 M☉
Surface gravity (log g)1.05 cgs
Temperature4,019 K
Other designations
44 Cyg, HD 195593, HIP 101214, WDS J20310+3656
A: HR 7847, IRAS 20290+3646, 2MASS J20305922+3656091, WISE J203059.22+365609.1
B: TYC 2697-1634-2
Database references
SIMBADdata
B

44 Cygni is a supergiant star in the constellation Cygnus. It is surrounded by the reflection nebula vdB 133. The nebula Sh 2-106 is found less than a degree to the northwest.

44 Cygni is the primary component of the double star AC 18. Its companion, AC 18 B, has a magnitude of 9.59 compared with 44 Cygni's magnitude of 6.2. They are visually separated by 2", making it challenging, but not impossible, to view optically.

vdB 133

vdB 133 (LBN 218) is the reflection nebula surrounding 44 Cygni. It is notable for being a much more white color than the blue of most reflection nebulae. The nebula has an apparent size of 12'. It is possible the reflection nebula is located on the far side of 44 Cygni as viewed from Earth, since the white light seen from the star differs from the more blue color expected from the scattering of light through a nebula.

References

  1. ↑ 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
  4. 1 2 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. ↑ Fabricius, C; Høg, E; Makarov, V. V; Mason, B. D; Wycoff, G. L; Urban, S. E (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  6. ↑ Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148–2158. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.
  7. ↑ Melnik, A. M.; Dambis, A. K. (2020). "Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions". Astrophysics and Space Science. 365 (7): 112. arXiv:2006.14649. Bibcode:2020Ap&SS.365..112M. doi:10.1007/s10509-020-03827-0. S2CID 220128144.
  8. 1 2 3 4 Lyubimkov, Leonid S.; Lambert, David L.; Korotin, Sergey A.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (2015). "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 446 (4): 3447. arXiv:1411.2722. Bibcode:2015MNRAS.446.3447L. doi:10.1093/mnras/stu2299.
  9. 1 2 3 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series. 268 (1): 4. arXiv:2208.11721. Bibcode:2023ApJS..268....4F. doi:10.3847/1538-4365/acdee5.
  10. 1 2 3 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardevol, J.; Casamiquela, L.; Figueras, F.; Jimenez-Arranz, O.; Jordi, C.; Monguio, M.; Romero-Gomez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
  11. ↑ "44 Cygni". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-09-11.
  12. ↑ "44 Cygni - Star in Cygnus | TheSkyLive".
  13. ↑ "Distant Lights - VDB 133".
  14. ↑ "Bernhard Hubl - vdB133". August 2008.
  15. ↑ "Vdb133 Reflection Neb_Sh2-106 Bipolar Neb".