Wolf 1061

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Star
wolf 1061
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Snake bearer
Right ascension 16 h 30 m 18.06 s
declination -12 ° 39 ′ 45.3 ″
Apparent brightness 10.07 (10.05-10.1) mag
Typing
Known exoplanets 3
B − V color index 1.57 
U − B color index 1.19 
R − I index 1.50 
Spectral class M3 V
Variable star type BY 
Astrometry
Radial velocity −21.22 ± 0.10 km / s
parallax 232.21 ± 0.06  mas
distance 14.04 ± 0.01  ly
4.31 ± 0.01  pc  
Visual absolute brightness M vis 11.87 likes
Proper movement 
Rec. Share: −94.03 ± 0.13  mas / a
Dec. portion: −1183.78 ± 0.08  mas / a
Physical Properties
Dimensions (0.310 ± 0.007)  M ☉
radius (0.322 ± 0.010)  R ☉
Luminosity

0.0102 ± 0.0066  L ☉

Effective temperature 3342 ± 49  K
Metallicity [Fe / H] -0.09 ± 0.09
Rotation time 94 ± 1
Other names
and catalog entries
Bonn survey BD −12 ° 4523
Gliese catalog FY 628 [1]
Hipparcos catalog HIP 80824 [2]
Tycho catalog TYC 5635-1241-1 [3]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J16301808-1239434 [4]
Other names V2306 Ophiuchi

Wolf 1061 (also known as Gliese 628, HIP 80824, and V2306 Ophiuchi) is a red dwarf belonging to the spectral class M, about 14 light years from the Sun and located in the constellation of the Serpent Bearer . It is in the top 50 of the next star systems and has a relatively high intrinsic motion of 1.2 arc seconds per year . Like most red dwarfs, Wolf 1061 has a slow rotation period of just under 100 days. The star is very stable, is probably not very active and has no special spectroscopic features. The star was first cataloged by the German astronomer Max Wolf in 1919 when he published a list of dark stars with high proper motions. The name Wolf 1061 comes from this list.

Planetary system

In December 2015, a team of astronomers from the University of New South Wales announced the discovery of three planets , orbiting Wolf 1061. The planets were discovered by analyzing 10 years of observational data collected by the HARPS spectrograph at the La Silla Observatory in Chile . By measuring the spectrum with the HARPS and photometric measurements by the All Sky Automated Survey , the team discovered two exoplanets with orbital times of 4.9 and 17.9 days, and very likely also a third with an orbital time of 67.3 days.

The masses of all three planets are low enough to be rocky planets like the inner planets in the solar system , although the actual size and density are still unknown. This could be determined by the obscuration of the star by the planets as seen from the earth. Since all three planets orbit the star relatively closely and have short orbital times, the chance that this will happen is high.

One of the planets, Wolf 1061c , is a super-earth that lies on the inner edge of the star's habitable zone , which ranges from about 0.073 to 0.190 AU . It is the closest known potentially habitable exoplanet to Earth.

Planetary System of Wolf 1061
planet Mass ( M ⊕ ) Semi-major axis ( AE ) Orbital time ( d ) eccentricity Radius ( R ⊕ )
Wolf 1061 b 1.91   +0.26−0.25 0.0375   +0.0012−0.0013 4.8869 ± 0.0005 0.15   +0.13−0.10 -
Wolf 1061 c 3.41   +0.43−0.41 0.0890   +0.0012−0.0013 17.8719 ± 0.0059 0.11   +0.10−0.07 -
Wolf 1061 d 7.70   +1.12−1.06 0.470   +0.015−0.017 217.21   +0.55−0.52 0.55   +0.08−0.09 -

See also

Web links

Commons : Wolf 1061  - Collection of pictures, videos and audio files

Individual evidence

  1. ↑ a b c d e f g h i j BD-12 4523. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 11, 2018 .
  2. ↑ a b V2306 Oph. In: VSX. AAVSO, accessed September 11, 2018 .
  3. ^ Wolf 1061. In: NASA Exoplanet Archive . Retrieved September 11, 2018 .
  4. ↑ a b c d e f g N Astudillo-Defru, T Forveille, X Bonfils, D Ségransan, F Bouchy, X Delfosse, C Lovis, M Mayor, F Murgas, F Pepe, N. C Santos, S Udry, A Wünsche : The HARPS search for southern extra-solar planets. XLI. A dozen planets around the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628, and GJ 3293 . In: Astronomy & Astrophysics . 602, 2017, p. A88. arxiv : 1703.05386 . bibcode : 2017A & A ... 602A..88A . doi : 10.1051 / 0004-6361 / 201630153 .
  5. ↑ a b P. E. Kervella, F. Arenou, F. Mignard, F. Thévenin: Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly . In: Astronomy & Astrophysics . 623, p. A72. arxiv : 1811.08902 . bibcode : 2019A & A ... 623A..72K . doi : 10.1051 / 0004-6361 / 201834371 .
  6. ↑ a b c Three planets orbiting Wolf 1061 (PDF) Retrieved December 17, 2015.
  7. ↑ Bárbara Rojas-Ayala, Kevin R. Covey, Philip S. Muirhead, James P. Lloyd: Metallicity and Temperature Indicators in M ​​Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs . In: The Astrophysical Journal . tape 748 , no. 2 , January 1, 2012, ISSN  0004-637X , p. 93 , doi : 10.1088 / 0004-637X / 748/2/93 ( iop.org [accessed August 4, 2016]).
  8. ↑ Stellar habitable zone calculator . University of Washington . Retrieved December 17, 2015.
  9. ↑ Cassy L. Davison, Russel J. White, Todd J. Henry, Adric R. Riedel, Wei-Chun Jao, John I. Bailey III, Samuel N. Quinn, Cantrell Justin R., Subasavage John P., Winters Jen G. .: A 3D Search for Companions to 12 Nearby M-Dwarfs . In: UNSW Paper . 2015.
  10. ↑ Sarah Griffiths: 'Super-Earth' is spotted just 14 light years away: Wolf 1061c is the closest 'habitable' planet outside our solar system ever found . Daily Mail . 17th December 2015.
  11. ↑ Stuart Gary: Potentially habitable super-Earth discovered orbiting star 14 light years from Earth . ABC News (Australia). 17th December 2015.