DP Leonis

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DP Leonis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo
Right ascension  11h 17m 16.00s[1]
Declination +17° 57′ 41.1″[1]
Apparent magnitude (V) 17.5-19[2]
Spectral type DA / M5V?
Variable type XM[2]
Radial velocity (Rv)0 km/s
Distance1304 ly
(400[3] pc)
Absolute magnitude (MV)9.5-11
Mass0.6/0.09 [4] M
Radius0.0114 [4]/0.12? R
Luminosity0.00449/0.00105? L
Temperature13,500/3000? K
Period (P)0.0001708 yr
Semi-major axis (a)0.0027 AU
Eccentricity (e)0.0
Inclination (i)79.5 [4]°
Other designations
DP Leo, X 11146+182[2]
Database references
Exoplanet Archivedata
Extrasolar Planets

DP Leonis (abbreviated DP Leo) is an eclipsing binary system approximately 1304 light-years away from the Sun,[4] probably a cataclysmic variable star of the AM Herculis-type also known as polars. The system comprises an eclipsing white dwarf and red dwarf in tight orbit (nearly 1.5 hours) and an extrasolar planet.[3]

Planetary system[edit]

In 2010, Qian et al. announced the detection of a third body of planetary mass around the eclipsing binary system. The presence of a third body had already been suspected in 2002.[4] The object is roughly 6 times more massive than Jupiter and is located 8.6 AU from the binary.

The DP Leonis planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b ≥6.1 ± 0.5 MJ 8.2 ± 0.4 28.0 ± 2.0 0.39 ± 0.13

See also[edit]


  1. ^ a b "V* DP Leo -- Cataclysmic Var. AM Her type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16.
  2. ^ a b c "Query= DP Leo". General Catalogue of Variable Stars. Centre de Données astronomiques de Strasbourg. Retrieved 2009-12-16.
  3. ^ a b Qian, S.-B.; et al. (2010). "Detection of a Giant Extrasolar Planet Orbiting the Eclipsing Polar DP Leo". The Astrophysical Journal Letters. 708 (1): L66–L68. Bibcode:2010ApJ...708L..66Q. doi:10.1088/2041-8205/708/1/L66.
  4. ^ a b c d e Schwope, A. D.; et al. (2002). "A multiwavelength timing analysis of the eclipsing polar DP Leo". Astronomy and Astrophysics. 392 (2): 541–551. arXiv:astro-ph/0111457. Bibcode:2002A&A...392..541S. doi:10.1051/0004-6361:20011651.
  5. ^ Beuermann, K.; et al. (2011). "The giant planet orbiting the cataclysmic binary DP Leonis". Astronomy and Astrophysics. 526. Article Number A53. arXiv:1011.3905. Bibcode:2011A&A...526A..53B. doi:10.1051/0004-6361/201015942.

Coordinates: Sky map 11h 17m 16.00s, +17° 57′ 41.1″