RS Puppis

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RS Puppis
Heic1323a -1243686232.jpg
RS Puppis as imaged by Hubble.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
Right ascension 08h 13m 04.21601s[1]
Declination −34° 34′ 42.7023″[1]
Apparent magnitude (V) 6.5-7.6[2]
Spectral type G2Ib[3] (G5-K7[4])
U−B color index 1.2[5]
B−V color index 1.5[5]
Variable type Cepheid Variable[6]
Radial velocity (Rv)24.60[7] km/s
Proper motion (μ) RA: -3.19[1] mas/yr
Dec.: 2.33[1] mas/yr
Parallax (π)0.524 ± 0.022[8] mas
Distance1,910[8] pc
Absolute magnitude (MV)-5.70[8]
Mass9.2[8] M
Radius194[9] R
Luminosity17,000[8] (15,000-30,000[10]L
Temperature4,500-6,500[10] K
Metallicity [Fe/H]0.17[11] dex
Age28[11] Myr
Other designations
HD 68860, HIP 40233, SAO 198944, CD−34°4488
Database references

RS Puppis (or RS Pup) is a Cepheid variable star in the constellation of Puppis. It is one of the brightest known Cepheids in the Milky Way galaxy and has one of the longest periods for this class of star, of 41.4[8] days.

Because it is located in a large nebula, astronomers using the ESO's New Technology Telescope at La Silla Observatory, Chile have been able to measure its distance in 2013 by strictly geometric analysis of light echoes from particles in the nebula, determining it to be 6500 ± 90 light years from Earth, the most accurate measurement achieved for any Cepheid as of early 2008. The accuracy of the new measurement is important because Cepheids serve as a marker for distances within the Milky Way galaxy and for nearby galaxies.



  1. ^ a b c d Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ Berdnikov, L. N.; Henden, A. A.; Turner, D. G.; Pastukhova, E. N. (2009). "Search for evolutionary changes in Cepheid periods using the Harvard plate collection: RS Puppis". Astronomy Letters. 35 (6): 406. Bibcode:2009AstL...35..406B. doi:10.1134/S1063773709060061. 
  3. ^ Luck, R. Earle; Bond, Howard E. (1989). "Supergiants and the Galactic metallicity gradient. II - Spectroscopic abundances for 64 distant F- to M-type supergiants". Astrophysical Journal Supplement Series. 71: 559. Bibcode:1989ApJS...71..559L. doi:10.1086/191386. 
  4. ^ Gaposchkin, Sergei (1952). "Variable stars in Milton field 38". Annals of Harvard College Observatory. 115: 197. Bibcode:1952AnHar.115..197G. 
  5. ^ a b Schaltenbrand, R.; Tammann, G. A. (1971). "The light curve parameters of photoelectrically observed galactic Cepheids". Astronomy and Astrophysics Supplement. 4: 265. Bibcode:1971A&AS....4..265S. 
  6. ^ 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: 02025. Bibcode:2009yCat....102025S. 
  7. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053Freely accessible. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  8. ^ a b c d e f Kervella, P.; Bond, H. E.; Cracraft, M.; Szabados, L.; Breitfelder, J.; Mérand, A.; Sparks, W. B.; Gallenne, A.; Bersier, D.; Fouqué, P.; Anderson, R. I. (2014). "The long-period Galactic Cepheid RS Puppis". Astronomy & Astrophysics. 572: A7. arXiv:1408.1697Freely accessible. Bibcode:2014A&A...572A...7K. doi:10.1051/0004-6361/201424395. 
  9. ^ Moskalik, P.; Gorynya, N. A. (2005). "Mean Angular Diameters and Angular Diameter Amplitudes of Bright Cepheids". Acta Astronomica. 55: 247. arXiv:astro-ph/0507076Freely accessible. Bibcode:2005AcA....55..247M. 
  10. ^ a b Mayes, A. J.; Evans, A.; Bode, M. F. (1985). "Infrared variability of the reflection nebulosity around RS Puppis". Astronomy and Astrophysics. 142: 48. Bibcode:1985A&A...142...48M. 
  11. ^ a b Marsakov, V. A.; Koval’, V. V.; Kovtyukh, V. V.; Mishenina, T. V. (2013). "Properties of the population of classical Cepheids in the Galaxy". Astronomy Letters. 39 (12): 851. Bibcode:2013AstL...39..851M. doi:10.1134/S1063773713120050. 

External links[edit]

Coordinates: Sky map 08h 13m 04.21601s, −34° 34′ 42.7023″