Astronomy:MOA-2007-BLG-192Lb

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MOA-2007-BLG-192Lb
An artist's impression of MOA-2007-BLG-192Lb orbiting its primary.
Discovery
Discovered byBennett et al.
Discovery siteMount John University
Observatory,
 New Zealand
Discovery date30 May 2008
Gravitational microlensing
Orbital characteristics
2.02±0.44 astronomical unit|AU[1]
StarMOA-2007-BLG-192L
Physical characteristics
Mass12.49+65.47
−8.03 M⊕ (likely between 3 and 12 M⊕)[1]


MOA-2007-BLG-192Lb, occasionally shortened to MOA-192 b,[2] is an extrasolar planet approximately 7,000 light-years away in the constellation of Sagittarius. The planet was discovered orbiting the low-mass star MOA-2007-BLG-192L. It was found when it caused a gravitational microlensing event on May 24, 2007, which was detected as part of the MOA-II microlensing survey at the Mount John University Observatory in New Zealand.[3]

The mass of the planet is not well-known. It is anything between 2.75 and 105 Earth masses (M⊕), although it is more likely to be between 3 and 12 M⊕. The mass range also means that the planet's classification varies, from a Super-Earth to a Sub-Saturn. It is located at 2.02 astronomical units from its host star.[1]

Host star

MOA-2007-BLG-192L
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sagittarius[lower-alpha 1]
Right ascension  18h 18m 03.8s[1]
Declination −27° 09′ 00.27″[1]
Characteristics
Evolutionary stage Red dwarf
Spectral type M[1]
Astrometry
Distance7040±980 ly
(2160±300 pc)
Details
Mass0.28±0.04[1] M☉
Database references
SIMBADdata

MOA-2007-BLG-192L is a red dwarf star, one of the smallest and least massive type of stars, as well as one of the most numerous in the Milky Way.[4] It was initially estimated to have a mass 6% the mass of the Sun, which would probably be too low to sustain nuclear fusion at its core, making it a dimly glowing brown dwarf.[5] However, this mass was based on an erroneous parallax, and a further analysis suggest a higher mass of 0.24 M☉. This would make it a red dwarf.[1]

Both MOA-2007-BLG-192L and its planet are located at a distance of 2,160 pc (7,000 ly) from Earth,[1] in the direction of the constellation Sagittarius.[lower-alpha 1]

Notes

  1. ↑ 1.0 1.1 Obtained with a right ascension of  18h 18m 03.8s and a declination of −27° 09′ 00.27″[1] on this website.

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 Terry, Sean K.; Beaulieu, Jean-Philippe; Bennett, David P.; Hamdorf, Euan; Bhattacharya, Aparna; Chaudhry, Viveka; Cole, Andrew A.; Koshimoto, Naoki et al. (2024-07-15). "Unveiling MOA-2007-BLG-192: An M Dwarf Hosting a Likely Super-Earth" (in en). The Astronomical Journal 168 (2): 72. doi:10.3847/1538-3881/ad5444. ISSN 1538-3881. 
  2. ↑ Planet Quest: New Worlds Atlas , JPL. Accessed on line July 2, 2008.
  3. ↑ Bennett, D. P. et al. (2008). "A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192". The Astrophysical Journal 684 (1): 663–683. doi:10.1086/589940. Bibcode: 2008ApJ...684..663B. 
  4. ↑ "Red dwarf star | Definition, Facts, & Temperature | Britannica" (in en). https://www.britannica.com/science/red-dwarf-star. 
  5. ↑ Smallest Extrasolar Planet Portends Other Earths , Richard A. Kerr, ScienceNOW Daily News, June 2, 2008. Accessed on line June 16, 2008.

Coordinates: Sky map 18h 08m 04s, −27° 09′ 00″



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