HD 195034

HD 195034

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Vulpecula
Right ascension	20h 28m 11.8149s[1]
Declination	+22° 07′ 44.375″[1]
Apparent magnitude (V)	7.088[1]
Characteristics
Spectral type	G5[1]
B−V color index	0.6[1]
V−R color index	0.4[1]
R−I color index	0.3[1]
Astrometry
Radial velocity (Rv)	−1.6 ± 0.2[1] km/s
Proper motion (μ)	RA: −23.55[1] mas/yr Dec.: −243.67[1] mas/yr
Parallax (π)	35.41 ± 0.80[1] mas
Distance	92 ± 2 ly (28.2 ± 0.6 pc)
Absolute magnitude (MV)	4.83[2]
Details
Mass	0.90 (0.85 to 0.97)[3] M☉
Temperature	5700[3] K
Metallicity	[Fe/H] = −0.17[3]
Rotational velocity (v sin i)	3[3] km/s
Age	7.6 (3.0 to 11.6) × 109[3] years
Other designations
BD+21 4221, HIP 100963, LTT 15980, NLTT 49310, PPM 111203, SAO 88711.[1]
Database references
SIMBAD	data

HD 195034 is a G-type star in the constellation of Vulpecula.^[1] It has an apparent visual magnitude of approximately 7.088.^[1] It has similar mass, metallicity and temperature to the Sun and was called a solar twin in a 2009 study, although its lithium abundance is three to four times that of the Sun.^[4]

References

1. ^ ^{a b c d e f g h i j k l m n} LTT 15980 -- High proper-motion Star, database entry, SIMBAD. Accessed on line February 8, 2011.
2. ^ From apparent magnitude and parallax.
3. ^ ^{a b c d e} HD 195034, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 8, 2011.
4. ^ Do Nascimento, J. D., Jr.; Castro, M.; Meléndez, J.; Bazot, M.; Théado, S.; Porto de Mello, G. F.; de Medeiros, J. R. (July 2009). "Age and mass of solar twins constrained by lithium abundance". Astronomy and Astrophysics 501 (2): 687–694. Bibcode 2009A&A...501..687D. doi:10.1051/0004-6361/200911935.