HD 118598
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 13h 38m 13.66s[1] |
| Declination | +23° 41′ 20.3″[1] |
| Apparent magnitude (V) | 8.228[1] |
| Characteristics | |
| Spectral type | G4V [2] |
| Astrometry | |
| Proper motion (μ) | RA: -196.7[1] mas/yr Dec.: 92.7[1] mas/yr |
| Parallax (π) | 20.56[3] mas |
| Details | |
| Temperature | 5,772[4] K |
| Metallicity [Fe/H] | −0.05[4] dex |
| Age | 4.3[citation needed] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 118598 also called HIP 66530, is a G-type star in the constellation Hydra that is located about 158.5 light years (48.614 parsecs) from the Sun. The measured properties of this star are very similar to those of the Sun, and is some time called a candidate Solar analog. However, it has a lower abundance of metals than the Sun and appears to be 0.3 billion years younger. HD 118598 photometric color is very close to that of the Sun. HD 118598 is a G4V stellar classification, the Sun is a G2V. However, HD 118598 is in a triple star system. A solar twin must be a star with no stellar companion, because the Sun itself is a solitary star.[2][4] [5]
Sun comparison[edit]
This chart compares the Sun to HP 129357.
| Identifier | J2000 Coordinates | Distance (ly) |
Stellar Class |
Temperature (K) |
Metallicity (dex) |
Age (Gyr) |
Notes | |
|---|---|---|---|---|---|---|---|---|
| Right ascension | Declination | |||||||
| Sun | — | — | 0.00 | G2V | 5,778 | +0.00 | 4.6 | [6] |
| HD 129357 [7] | 14h 41m 22.4s | +29° 03′ 32″ | 158 | G4V | 5,772 | −0.05 | 4.3 | [2][4] |
To date, no solar twin with an exact match as that of the Sun has been found. However, there are some stars that come very close to being identical to that of the Sun, and are considered solar twins by the majority of the public. An exact solar twin would be a G2V star with a 5,778K temperature, be 4.6 billion years old, with the correct metallicity and a 0.1% solar luminosity variation.[8] Stars with an age of 4.6 billion years are at the most stable state. Proper metallicity and size are also very important to low luminosity variation.[9][10][11]
References[edit]
- ↑ 1.0 1.1 1.2 1.3 1.4 Syky Map. "HD 118598".
- ↑ 2.0 2.1 2.2 Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I.; Mendez, Rene A.; Horch, Elliott P. (2015). "Speckle Interferometry at Soar in 2014". The Astronomical Journal. 150 (2): 50. arXiv:1506.05718. doi:10.1088/0004-6256/150/2/50.
- ↑ 3.0 3.1 "HD 118598-- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2016-09-09.
- ↑ 4.0 4.1 4.2 4.3 Porto De Mello, G. F.; Da Silva, R.; Da Silva, L.; De Nader, R. V. (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 & Astrophysics. 563: A52. arXiv:1312.7571. Bibcode:2014A&A...563A..52P. doi:10.1051/0004-6361/201322277.
- ↑ arxiv, SPECKLE INTERFEROMETRY AT SOAR IN 2014† Andrei Tokovinin, Cerro Tololo Inter-American Observatory, June 19, 2015
- ↑ Williams, D.R. (2004). "Sun Fact Sheet". NASA. Retrieved 2009-06-23.
- ↑ HD 129357 at SIMBAD - Ids - Bibliography - Image.
- ↑ NASA, Science News, Solar Variability and Terrestrial Climate, Jan. 8, 2013
- ↑ University of Nebraska-Lincoln astronomy education group, Stellar Luminosity Calculator
- ↑ National Center for Atmospheric Research, The Effects of Solar Variability on Earth's Climate, 2012 Report
- ↑ Most of Earth’s twins aren’t identical, or even close!, by Ethan on June 5, 2013
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