HD 143436

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HD 143436
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 16h 00m 18.83807s[1]
Declination +00° 08′ 13.2332″[1]
Apparent magnitude (V) 8.03[2]
Characteristics
Spectral type G3V[3]
B−V color index 0.644[4]
Astrometry
Radial velocity (Rv) −24.7 ± 0.7[4] km/s
Proper motion (μ) RA: −135.26[1] mas/yr
Dec.: −108.52[1] mas/yr
Parallax (π) 24.67 ± 0.95[1] mas
Distance 132 ± 5 ly
(41 ± 2 pc)
Absolute magnitude (MV) 4.87 ± 0.10[4]
Details
Mass 1.01 ± 0.02[4] M
Surface gravity (log g) 4.28 ± 0.12[4] cgs
Temperature 5768 ± 43[4] K
Metallicity [Fe/H] 0.008[4] dex
Rotational velocity (v sin i) < 2.6[4] km/s
Age 3.8 ± 2.9[4] Gyr
Other designations
BD+00 3441, HIP 78399, LTT 14757, NLTT 41715, PPM 162138, SAO 121307
Database references
SIMBAD data

HD 143436 also known as HIP 78399 is a G-type star in the constellation Serpens. The temperature, rotation, mass, and abundance of elements in this star are close to properties of the Sun, and for this reason it is a solar twin candidate. The only notable difference is an approximately six times higher abundance of lithium compared to the Sun and a much younger age at 3.8 Gyr. The space velocity components of this star are (U, V, W) = (−19.2, −38.6, −7.0) km/s.[4]

Sun comparison[edit]

This chart compares the Sun to HD 143436.

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 [5]
HD 143436 [6] 16h 00m 18.8s +00° 08′ 13″ 132 G3V 5768 +0.008 3.8 [4] [7]


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 such 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]

Morgan-Keenan spectral classification of stars. Most common star type in the universe are M-dwarfs, 76%. The sun is a 4.6 billion year-old G-class (G2V) star and is more massive than 95% of all stars. Only 7.6% are G-class stars

References[edit]

  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. 
  3. ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 05: 0. Bibcode:1999MSS...C05....0H. 
  4. ^ a b c d e f g h i j k King, Jeremy R.; Boesgaard, Ann M.; Schuler, Simon C. (November 2005). "Keck HIRES Spectroscopy of Four Candidate Solar Twins". The Astronomical Journal. 130 (5): 2318–2325. arXiv:astro-ph/0508004Freely accessible. Bibcode:2005AJ....130.2318K. doi:10.1086/452640. 
  5. ^ Williams, D.R. (2004). "Sun Fact Sheet". NASA. Retrieved 2009-06-23. 
  6. ^ HD 143436 at SIMBAD - Ids - Bibliography - Image.
  7. ^ "HD 143436 Database". Sky map. Skymap.org. Retrieved 2009-01-14. 
  8. ^ NASA, Science News, Solar Variability and Terrestrial Climate, Jan. 8, 2013
  9. ^ University of Nebraska-Lincoln astronomy education group, Stellar Luminosity Calculator
  10. ^ National Center for Atmospheric Research, The Effects of Solar Variability on Earth's Climate, 2012 Report
  11. ^ Most of Earth’s twins aren’t identical, or even close!, by Ethan on June 5, 2013