RS Puppis

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RS Puppis
RS Puppis as imaged by Hubble.[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Puppis
Right ascension 08h 13m 04s
Declination −34° 34′ 42″
Apparent magnitude (V) 7.0
Spectral type F8Iab
Variable type Cepheid Variable
Distance >6500 ly
Mass 10 M
Radius 200 R
Luminosity 15,000 L

RS Puppis (or RS Pup) is a Cepheid variable star in the constellation of Puppis.

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 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 (standard candle) within our galaxy and for nearby galaxies.[2][3][4]



  1. ^ "RS Puppis puts on a spectacular light show". ESA/Hubble Press Release. Retrieved 18 December 2013. 
  2. ^ Kervella, Pierre (2008-02-11). "Light echoes whisper the distance to a star" (Press release). European Southern Observatory. Retrieved 2013-09-09. 
  3. ^ Animation of the light echo
  4. ^ RS Pup Vital Statistics

External links[edit]