HR 7722

Cordoba Survey	CD 27 14659
Bright Star Catalog	HR 7722 [1]
Henry Draper Catalog	HD 192310 [2]
Gliese catalog	FY 785 [3]
Hipparcos catalog	HIP 99825 [4]
SAO catalog	SAO 189065 [5]
Tycho catalog	TYC 6914-1943-1 [6]
2MASS catalog	2MASS J20151734-2701585 [7]
Other names	5 G. Capricorni, LHS 488, LTT 8009, GCTP 4804.00, NSV 12933

HR 7722 (also 5 G. Capricorni or Gliese 785 ) is a yellowish-orange main sequence star of the spectral class K in the constellation Capricorn . At a distance of just over 29 light years , it still belongs to the stellar neighborhood of the sun . Its apparent brightness is sufficient enough to be seen with the naked eye. HR 7722 is believed to be a variable star , but this is unconfirmed. The star has a planetary system with two known exoplanets .

properties

HR 7722 has around 78% of the solar mass and, depending on the estimation method, 79% to 85% of the solar radius . It is older than the Sun, with age estimates ranging from 7.5 to 8.9 billion years. The proportions of elements other than hydrogen or helium and thus the metallicity are comparable to the sun.

The components of space velocity for the star are U = −69, V = −13 and W = −14 km / s. It orbits the galactic center with an eccentricity of 0.18 at a distance of 8.1 kiloparsecs .

Planetary system

A planet about the mass of Neptune was discovered in 2010 with the help of the HIRES instrument at the Keck Observatory . A second planet in the system was found in 2011 with the Échelle spectrograph HARPS of the European Southern Observatory and its discovery was published together with that of HD 85512 b and the planets of 82 G. Eridani . The determination of the mass for the second planet is uncertain because of the incomplete coverage of the orbit by the measurements. Both planets could resemble Neptune in composition. They orbit the star along the inner and outer boundaries of the habitable zone .

Planetary system from HR 7722
Planet (by distance from the star)	Discovery (year)	Mass (in M _⊕ )	Cycle time (in days)	Major semi-axis (in AU )	Orbit inclination (in ) ${\ displaystyle \ mathrm {^ {\ circ}}}$	eccentricity
HR 7722 b	2010	16.9 ± 0.9	74.72 ± 0.10	0.320 ± 0.005	90	0.13 ± 0.04
HR 7722 c	2011	24 ± 5	525.8 ± 9.2	1.180 ± 0.025	90	0.32 ± 0.11

Web links

SolStation.com: CD-27 14659 / HR 7722 / Gl 785.Retrieved June 21, 2015 . (English)

Individual evidence

^ ^A ^b ^c van Leeuwen, F .: Validation of the new Hipparcos reduction . arxiv : 0708.1752 .
^ ^A ^b ^c Johnson, HL et al .: UBVRIJKL photometry of the bright stars . bibcode : 1966CoLPL ... 4 ... 99J .
^ Gray, RO et al .: Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample . arxiv : astro-ph / 0603770 .
↑ Nordström, B. et al .: The Geneva-Copenhagen survey of the Solar neighborhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs . arxiv : astro-ph / 0405198 .
↑ ^a ^b ^c Mamajek, Eric E .; Hillenbrand, Lynne A .: Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics . arxiv : 0807.1686 .
↑ ^a ^b Santos, NC; Israelian, G .; Mayor, M .: The metal-rich nature of stars with planets . arxiv : astro-ph / 0105216 .
↑ ^a ^b Pasinetti Fracassini, LE et al .: Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third Edition - Comments and Statistics . arxiv : astro-ph / 0012289 .
↑ ^a ^b ^c ^d Pepe, F. et al .: The HARPS search for Earth-like planets in the habitable zone: I - Very low-mass planets around HD20794, HD85512 and HD192310 . arxiv : 1108.3447 .
↑ ^a ^b ^c Ecuvillon, A. et al .: Nitrogen abundances in Planet-harboring stars . arxiv : astro-ph / 0401396 .
^ Porto de Mello, G .; Del Peloso, EF: Astrobiologically Interesting Stars within 10 parsecs of the Sun . arxiv : astro-ph / 0511180 .
↑ Howard, AW; Johnson, YES; Marcy, GW; Fischer, DA; Wright, JT; Henry, GW; Isaacson, H .; Valentini, YES; Anderson, J .; Piskunov, NE: The NASA-UC Eta-Earth Program: III. A Super-Earth orbiting HD 97658 and a Neptune-mass planet orbiting Gl 785 . arxiv : 1011.0414 .
↑ ^a ^b NASA Exoplanet Archive: HD 192310. Retrieved June 21, 2015 .

[van_Leeuwen-1] A ^b ^c van Leeuwen, F .: Validation of the new Hipparcos reduction . arxiv : 0708.1752 .

[Johnson-2] A ^b ^c Johnson, HL et al .: UBVRIJKL photometry of the bright stars . bibcode : 1966CoLPL ... 4 ... 99J .

[3] Gray, RO et al .: Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample . arxiv : astro-ph / 0603770 .

[4] Nordström, B. et al .: The Geneva-Copenhagen survey of the Solar neighborhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs . arxiv : astro-ph / 0405198 .

[Mamajek-5] Mamajek, Eric E .; Hillenbrand, Lynne A .: Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics . arxiv : 0807.1686 .

[Santos-6] Santos, NC; Israelian, G .; Mayor, M .: The metal-rich nature of stars with planets . arxiv : astro-ph / 0105216 .

[Fracassini-7] Pasinetti Fracassini, LE et al .: Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third Edition - Comments and Statistics . arxiv : astro-ph / 0012289 .

[Pepe-8] Pepe, F. et al .: The HARPS search for Earth-like planets in the habitable zone: I - Very low-mass planets around HD20794, HD85512 and HD192310 . arxiv : 1108.3447 .

[Ecuvillon-9] Ecuvillon, A. et al .: Nitrogen abundances in Planet-harboring stars . arxiv : astro-ph / 0401396 .

[10] Porto de Mello, G .; Del Peloso, EF: Astrobiologically Interesting Stars within 10 parsecs of the Sun . arxiv : astro-ph / 0511180 .

[11] Howard, AW; Johnson, YES; Marcy, GW; Fischer, DA; Wright, JT; Henry, GW; Isaacson, H .; Valentini, YES; Anderson, J .; Piskunov, NE: The NASA-UC Eta-Earth Program: III. A Super-Earth orbiting HD 97658 and a Neptune-mass planet orbiting Gl 785 . arxiv : 1011.0414 .

[Exoplanet-12] NASA Exoplanet Archive: HD 192310. Retrieved June 21, 2015 .