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SP77 46-44

Topic: Astronomy

 From HandWiki - Reading time: 4 min
Short description: Star in the constellation Dorado
SP77 46-44
Observation data
Equinox J2000.0]] (ICRS)
Constellation Dorado[1]
Right ascension  05h 29m 42.2038s[2]
Declination −68° 57′ 17.351″[2]
Apparent magnitude (V) 11.54 (var.)[3]
Characteristics
Evolutionary stage Red supergiant
Spectral type M2.5 Ia-Iab[4]
Apparent magnitude (B) 14.04[5]
Apparent magnitude (V) 12.15[5]
Apparent magnitude (R) 10.99[5]
Apparent magnitude (J) 7.922±0.024[6]
Apparent magnitude (H) 7.192±0.047[6]
Apparent magnitude (K) 6.886±0.029[6]
B−V color index 1.89
V−R color index 1.16
J−H color index 0.730
J−K color index 1.036
Variable type yes[3]
Astrometry
Radial velocity (Rv)273.0±0.3[5] km/s
Proper motion (μ) RA: 1.445[2] mas/yr
Dec.: 0.463[2] mas/yr
Details
Radius1,278[lower-alpha 1] R☉
Luminosity221,000[7] – 251,000[8] L☉
Surface gravity (log g)0.5[7] cgs
Temperature3,500[7] K
Other designations
SP77 46-44, WOH S341, W60 A27, 2MASS J05294221-6857173[9]
Database references
SIMBADdata

SP77 46-44 (WOH S341) is a red supergiant star found in the Large Magellanic Cloud in the constellation of Dorado. It is one of the largest stars discovered, with a radius over 1,200 solar radii. If placed in the Solar System, its photosphere would engulf the orbit of Jupiter.

The apparent magnitude of SP77 46-44 varies by about 0.8 magnitudes around 11.5.[3] No variable star classification has been assigned.[10]

Notes

  1. ↑ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    [math]\displaystyle{ \sqrt{(5772/3500)^4 * 220,830} = 1,278.04\ R\odot }[/math]

References

  1. ↑ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. http://djm.cc/constellation.html. Retrieved 16 July 2020. 
  2. ↑ 2.0 2.1 2.2 2.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Szczygieł, D. M.; Stanek, K. Z.; Bonanos, A. Z.; Pojmański, G.; Pilecki, B.; Prieto, J. L. (2010). "Variability of Luminous Stars in the Large Magellanic Cloud Using 10 Years of ASAS Data". The Astronomical Journal 140 (1): 14. doi:10.1088/0004-6256/140/1/14. Bibcode: 2010AJ....140...14S. 
  4. ↑ González-Fernández, Carlos; Dorda, Ricardo; Negueruela, Ignacio; Marco, Amparo (2015). "A new survey of cool supergiants in the Magellanic Clouds". Astronomy & Astrophysics 578: A3. doi:10.1051/0004-6361/201425362. Bibcode: 2015A&A...578A...3G. 
  5. ↑ 5.0 5.1 5.2 5.3 Massey, Philip; Olsen, K. A. G. (2003). "The Evolution of Massive Stars. I. Red Supergiants in the Magellanic Clouds". The Astronomical Journal 126 (6): 2867–2886. doi:10.1086/379558. Bibcode: 2003AJ....126.2867M. 
  6. ↑ 6.0 6.1 6.2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246. 
  7. ↑ 7.0 7.1 7.2 Groenewegen, Martin A. T.; Sloan, Greg C. (2018). "Luminosities and mass-loss rates of Local Group AGB stars and Red Supergiants". Astronomy & Astrophysics 609: A114. doi:10.1051/0004-6361/201731089. ISSN 0004-6361. Bibcode: 2018A&A...609A.114G. 
  8. ↑ Davies, Ben; Crowther, Paul A.; Beasor, Emma R. (2018). "The luminosities of cool supergiants in the Magellanic Clouds, and the Humphreys–Davidson limit revisited". Monthly Notices of the Royal Astronomical Society 478 (3): 3138–3148. doi:10.1093/mnras/sty1302. Bibcode: 2018MNRAS.478.3138D. 
  9. ↑ "[W60 A27 -- Red supergiant star"]. SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=SP77+46-44. Retrieved 1 August 2020. 
  10. ↑ Samus, N. N. 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: B/gcvs. Bibcode: 2009yCat....102025S. 





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