G 240-72

G 240-72
Observation data
Epoch J2000[1]      Equinox J2000[1]
Constellation Draco
Right ascension 17h 48m 08.17s[1]
Declination +70° 52′ 35.3″[1]
Apparent magnitude (V) 14.15[2]
Characteristics
Spectral type DQP9.0[2]
Apparent magnitude (B) 14.55[1]
Apparent magnitude (V) 14.15[1]
Apparent magnitude (R) 13.5[1]
Apparent magnitude (I) 13.1[1]
Apparent magnitude (J) 12.709 ± 0.021[1]
Apparent magnitude (H) 12.528 ± 0.023[1]
Apparent magnitude (K) 12.507 ± 0.023[1]
Astrometry
Proper motion (μ) RA: -1261[3] mas/yr
Dec.: 1112[3] mas/yr
Parallax (π)160.9952 ± 0.0119 mas[4]
Distance20.259 ± 0.001 ly
(6.2114 ± 0.0005 pc)
Absolute magnitude (MV)15.23[2][5][note 1]
Details
Mass0.81 ± 0.01[2] M☉
Radius0.00984[2][note 2] R☉
Luminosity0.000085[6] L☉
Surface gravity (log g)8.36 ± 0.02[2] cgs
Temperature5590 ± 90[2] K
Rotation>100 years[7]
Age5.69[note 3][3] Gyr
Other designations
WD 1748+708,[2][3] LHS 455,[2] LP 44-113,[1] NLTT 45565,[1] GJ 1221,[5] EGGR 372,[1] 2MASS J17480817+7052353[1]
Database references
SIMBADdata
G 240-72 is located in the constellation Draco
G 240-72 is located in the constellation Draco
G 240-72
Location of G 240-72 in the constellation Draco

G 240-72 (or WD 1748+708, or LHS 455, or GJ 1221) is a nearby degenerate star (white dwarf) of spectral class DQP9.0,[2] located in constellation Draco.

  1. ^ a b c d e f g h i j k l m n o "GJ 1221 -- White Dwarf". Centre de Données astronomiques de Strasbourg. Retrieved 2011-10-23.
  2. ^ a b c d e f g h i j Holberg, J. B.; Sion; Oswalt; McCook; Foran; Subasavage (2008). "A New Look at the Local White Dwarf Population". The Astronomical Journal. 135 (4): 1225–1238. Bibcode:2008AJ....135.1225H. doi:10.1088/0004-6256/135/4/1225. S2CID 122855486.
  3. ^ a b c d Sion, Edward M.; Holberg; Oswalt; McCook; Wasatonic (2009). "The White Dwarfs within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal. 138 (6): 1681–1689. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681. S2CID 119284418.
  4. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ a b Cite error: The named reference van Altena1995 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference ApJS199_2_29 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Brinkworth2013 was invoked but never defined (see the help page).


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