HD 150248

HD 150248 is a Sun-like star 87 light-years (26.6 parsecs) from the Sun. HD 150248 is a G-type star and a near solar twin.^[4] HD 150248's photometric color is also very close to that of the Sun; however, it has a lower abundance of metals, and has an apparent visual magnitude of 7.02. At 6.2 billion years old, this star is 1.6 billion years older than the Sun and has passed the stable burning stage.^{[citation needed]} HD 150248 is found on the border between the constellations Scorpius and Ara.

HD 150248

Observation data Epoch J2000      Equinox J2000
Constellation	Scorpius
Right ascension	16h 41m 49.80149s[1]
Declination	−45° 22′ 07.4106″[1]
Apparent magnitude (V)	7.02[2]
Characteristics
Spectral type	G3V + ?[3]
U−B color index	+0.17[2]
B−V color index	+0.68[2]
Astrometry
Parallax (π)	37.54 ± 0.50 mas[1]
Distance	87 ± 1 ly (26.6 ± 0.4 pc)
Details
Mass	1.020[citation needed] M☉
Surface gravity (log g)	4.40±0.02[4] cgs
Temperature	5,715±5[4] K
Metallicity [Fe/H]	−0.086±0.004[4] dex
Rotational velocity (v sin i)	1.43±0.12[4] km/s
Age	7.53±0.58[4] Gyr
Other designations
CD−45°10847, HD 150248, HIP 81746
Database references
SIMBAD	data

To date, no solar twin with an exact match to that of the Sun has been found. However, there are some stars that come very close to being identical, and thus considered solar twins by the astronomical community. An exact solar twin would be a G2V star with a 5,778K temperature, be 4.6 billion years old, with solar metallicity, and a 0.1% solar luminosity variation.^[5] Stars with an age of 4.6 billion years, such as the Sun, are at the most stable state. Proper metallicity and size are also very important to low luminosity variation.^[6][7][8]

Comparison to the Sun

Identifier	J2000 Coordinates		Distance (ly)	Stellar Type	Temperature (K)	Metallicity (dex)	Age (Gyr)	Notes
	Right ascension	Declination
Sun	—	—	0.00	G2V	5,778	+0.00	4.6	[9]
HD 150248 [10]	16h 41m 49.8s	–45° 22′ 07″	88	G3V	5,723	−0.04	6.2	[11]

See also

• List of nearest stars

References

1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
2. Przybylski, A.; Kennedy, P. M. (1965). "Radial velocities and three-colour photometry of 166 southern stars". Monthly Notices of the Royal Astronomical Society. 131: 95–104. Bibcode:1965MNRAS.131...95P. doi:10.1093/mnras/131.1.95.
3. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
4. dos Santos, Leonardo A.; et al. (August 2016), "The Solar Twin Planet Search. IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars", Astronomy & Astrophysics, 592: 8, arXiv:1606.06214, Bibcode:2016A&A...592A.156D, doi:10.1051/0004-6361/201628558, S2CID 53533614, A156.
5. NASA, Science News, Solar Variability and Terrestrial Climate, Jan. 8, 2013
6. University of Nebraska-Lincoln astronomy education group, Stellar Luminosity Calculator
7. National Center for Atmospheric Research, The Effects of Solar Variability on Earth's Climate, 2012 Report
8. Most of Earth’s twins aren’t identical, by Ethan on June 5, 2013
9. Williams, D.R. (2004). "Sun Fact Sheet". NASA. Retrieved 2009-06-23.
10. HD 150248 at SIMBAD - Ids - Bibliography - Image.
11. Porto de Mello, G. F.; da Silva, R.; da Silva, L. & de Nader, R. V. (March 2014). "A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun". Astronomy and Astrophysics. 563: A52. arXiv:1312.7571. Bibcode:2014A&A...563A..52P. doi:10.1051/0004-6361/201322277. S2CID 119111150.