NGC 2423-3b is an extrasolar planet[1] approximately 2498 light-years away in the constellation of Puppis. The planet was announced in 2007 to be orbiting the red giant star NGC 2423-3 (which in turn is part of the NGC 2423 open cluster). The planet has a mass at least 10.6 times that of Jupiter. Only the minimum mass is known since the orbital inclination is not known, so it may instead be a brown dwarf.

NGC 2423-3 b

Discovery
Discovered by	Mayor et al.
Discovery site	France
Discovery date	21 June 2007
Detection method	Doppler spectroscopy
Orbital characteristics
Apastron	2.54 AU (380,000,000 km)
Periastron	1.66 AU (248,000,000 km)
Semi-major axis	2.1 AU (310,000,000 km)
Eccentricity	0.21 ± 0.07
Orbital period (sidereal)	714.3 ± 5.3 d
Time of periastron	2,453,213 ± 21
Argument of periastron	18 ± 10
Semi-amplitude	71.5
Star	NGC 2423-3
Physical characteristics
Mass	>10.6 MJ

This planet was discovered by Christophe Lovis and Michel Mayor in June 2007. Lovis had also found three Neptune-mass planets orbiting HD 69830 in May 2006, also in Puppis.

See also

• NGC 4349-127 b
• PSR B1620-26 b

References

• SIMBAD NGC 2423 3 b

External links

• "NGC 2423 3". Exoplanet. Archived from the original on 2009-11-25. Retrieved 2008-08-11.
• "Notes for planet NGC 2423 3 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-11.

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