HD 85512 b
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HD 85512 b (auch Gliese 370 b) ist ein extrasolarer Planet, der HD 85512, einen K-Typ-Stern, umkreist. Der Planet ist ungefähr 36 Lichtjahre von der Erde entfernt und liegt im Sternbild Vela.
Der Planet befindet sich am inneren Rand der habitablen Zone, weit genug von seinem Zentralgestirn entfernt, dass Wasser noch in flüssiger Form auftritt.[1][2] Aufgrund seiner Masse von 3,6 Erdmassen zählt er zu den Supererden.
Eigenschaften
HD 85512 b benötigt 54 Tage um HD 85512 einmal zu umkreisen. Die Temperatur in der oberen Atmosphäre beträgt geschätzte 298 K (25 °C).[3]
Entdeckung
HD 85512 b wurde von Wissenschaftlern der Universität Genf entdeckt, geleitet vom Schweizer Astronom Stéphane Udry des GTO Programms von HARPS (High Accuracy Radial velocity Planet Searcher) am 17. August 2011.[4]
Weblinks
Einzelnachweise
- ↑ arxiv.org: A Habitable Planet around HD 85512? von L. Kaltenegger, S. Udry und F. Pepe vom 17. August 2011
- ↑ F. Pepe, et al.: The HARPS search for Earth-like planets in the habitable zone: I – Very low-mass planets around HD20794, HD85512 and HD192310. In: Astronomy & Astrophysics. 2011. arxiv:1108.3447. bibcode:2011yCat..35349058P. doi:10.1051/0004-6361/201117055.
- ↑ centauri-dreams.org: HARPS: Hunting for Nearby Earth-like Planets von Paul Gilster vom 23. August 2011
- ↑ Spiegel Online Neu entdeckter Planet schwebt in grüner Zone vom 27. August 2011
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Autor/Urheber: Icalanise, Lizenz: CC0
Plot of the orbit of HD 85512 b compared to the star's habitable zone
Orbit data taken from Pepe et al. (2011), arXiv:1108.3447v1 [astro-ph.EP] "The HARPS search for Earth-like planets in the habitable zone: I – Very low-mass planets around HD20794, HD85512 and HD192310"
The configuration is given in Table 5. Uncertainties in the quantities are not depicted.
The habitable zone limits are computed using the formulae given in: Underwood et al. (2003), International Journal of Astrobiology vol. 2 (4), pp. 289–299 "The evolution of habitable zones during stellar lifetimes and its implications on the search for extraterrestrial life"
The habitable zone is colour-coded as follows:
- Red: Recent Venus (inner) – Runaway greenhouse (outer)
- Yellow: Runaway greenhouse (inner) – Water loss (outer)
- Green: Water loss (inner) – First CO2 condensation (outer)
- Cyan: First CO2 condensation (inner) – Maximum greenhouse (outer)
- Blue: Maximum greenhouse (inner) – Early Mars (outer)
Using this definition of the habitable zone, the most conservative habitable zone is the green region, the inner boundary corresponding to the start of water loss and the outer limit corresponding to the first condensation of carbon dioxide in the atmosphere.
Scale: 10000 SVG units = 1 AUAutor/Urheber: ESO/M. Kornmesser, Lizenz: CC BY 4.0
This artist’s impression shows the planet orbiting the Sun-like star HD 85512 in the southern constellation of Vela (The Sail). This planet is one of sixteen super-Earths discovered by the HARPS instrument on the 3.6-metre telescope at ESO’s La Silla Observatory. This planet is about 3.6 times as massive as the Earth and lies at the edge of the habitable zone around the star, where liquid water, and perhaps even life, could potentially exist.