HD 192310 (also known as 5 G. Capricorni or Gliese 785) is a star in the southern constellation of Capricornus. It is located in the solar neighborhood at a distance of 28.7 light-years (8.8 parsecs), and is within the range of luminosity needed to be viewed from the Earth with the unaided eye. (According to the Bortle scale, it can be viewed from dark suburban skies.) HD 192310 is suspected of being a variable star, but this is unconfirmed.
The space velocity components of this star are (U, V, W) = (–69, –13, –14) km/s. It is following an orbit through the Milky Way galaxy that has an orbital eccentricity of 0.18 at a mean galactocentric distance of 8.1 kpc.[11] The star will achieve perihelion in around 82,200 years when it comes within 20.18 ly (6.188 pc) of the Sun.[12]
Planetary system
The system has a Neptune-mass planet "b", discovered in 2010.[13] A second planet "c" was found in this system in 2011 by the HARPS GTO program, along with HD 85512 b and the planets of 82 G. Eridani. The uncertainty in the mass of the second planet is much higher than for the first because of the lack of coverage around the full orbit. Both planets may be similar in composition to Neptune. They are orbiting along the inner and outer edges of the habitable zone for this star.[8][14]
A study in 2023 updated the parameters of these two planets, and identified a number of additional radial velocity signals. While most of these signals are attributed to stellar activity, one is considered a planet candidate. If real, this third planet would be a super-Earth orbiting closer to the star than the two known planets.[15]: 31
^ abcdeVallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
^ abcJohnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
^ abGray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992
^Samus, N. N.; Durlevich, O. V.; et al. (2009), "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1: B/gcvs, Bibcode:2009yCat....102025S
^ abcMamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal, 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785, S2CID 27151456
^ abSantos, N. C.; Israelian, G.; Mayor, M. (July 2001), "The metal-rich nature of stars with planets", Astronomy and Astrophysics, 373 (3): 1019–1031, arXiv:astro-ph/0105216, Bibcode:2001A&A...373.1019S, doi:10.1051/0004-6361:20010648, S2CID 119347084
^ abPasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
^ abcdefPepe, F.; et al. (2011), "The HARPS search for Earth-like planets in the habitable zone", VizieR On-line Data Catalog: J/A+A/534/A58, vol. 534, pp. A58, arXiv:1108.3447, Bibcode:2011yCat..35340058P, doi:10.1051/0004-6361/201117055, S2CID 15088852
^ abcdEcuvillon, A.; et al. (May 2004), "Nitrogen abundances in planet-harbouring stars", Astronomy and Astrophysics, 418 (2): 703–715, arXiv:astro-ph/0401396, Bibcode:2004A&A...418..703E, doi:10.1051/0004-6361:20035717, S2CID 55400558
^Porto de Mello, Gustavo; del Peloso, Eduardo F. (April 2006), "Astrobiologically Interesting Stars Within 10 Parsecs of the Sun", Astrobiology, 6 (2): 308–331, arXiv:astro-ph/0511180, Bibcode:2006AsBio...6..308P, doi:10.1089/ast.2006.6.308, PMID 16689649, S2CID 119459291
^Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35
^Howard, Andrew W.; Johnson, John Asher; et al. (March 2011). "The NASA-UC Eta-Earth Program: III. A Super-Earth orbiting HD 97658 and a Neptune-mass planet orbiting Gl 785". The Astrophysical Journal. 730 (1): 10. arXiv:1011.0414. Bibcode:2011ApJ...730...10H. doi:10.1088/0004-637X/730/1/10. S2CID 17943021.
^Schneider, Jean, , Extrasolar Planets Encyclopaedia, archived from the original on 2011-11-08, retrieved 2011-10-29
^ abLaliotis, Katherine; Burt, Jennifer A.; et al. (February 2023). "Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions". The Astronomical Journal. arXiv:2302.10310.
192310, also, known, capricorni, gliese, star, southern, constellation, capricornus, located, solar, neighborhood, distance, light, years, parsecs, within, range, luminosity, needed, viewed, from, earth, with, unaided, according, bortle, scale, viewed, from, d. HD 192310 also known as 5 G Capricorni or Gliese 785 is a star in the southern constellation of Capricornus It is located in the solar neighborhood at a distance of 28 7 light years 8 8 parsecs and is within the range of luminosity needed to be viewed from the Earth with the unaided eye According to the Bortle scale it can be viewed from dark suburban skies HD 192310 is suspected of being a variable star but this is unconfirmed HD 192310Location of HD 192310 circled Observation dataEpoch J2000 Equinox J2000Constellation CapricornusRight ascension 20h 15m 17 39138s 1 Declination 27 01 58 7116 1 Apparent magnitude V 5 73 2 CharacteristicsSpectral type K2 V 3 U B color index 0 64 2 B V color index 0 88 2 Variable type Suspected 4 AstrometryRadial velocity Rv 54 41 0 13 1 km sProper motion m RA 1242 763 mas yr 1 Dec 181 175 mas yr 1 Parallax p 113 4872 0 0516 mas 1 Distance28 74 0 01 ly 8 812 0 004 pc Absolute magnitude MV 6 0 5 DetailsMass0 78 0 04 6 M Radius0 79 0 85 7 R Luminosity0 385 0 007 8 L Surface gravity log g 4 38 0 19 9 cgsTemperature5069 49 9 KMetallicity Fe H 0 01 0 05 9 dexRotation47 7 4 9 days 8 Rotational velocity v sin i lt 3 8 km sAge7 5 8 9 5 GyrOther designations5 G Capricorni CD 27 14659 GCTP 4804 00 Gl 785 HD 192310 HIP 99825 HR 7722 LHS 488 LTT 8009 NSV 12933 SAO 189065Database referencesSIMBADdataARICNSdata Contents 1 Description 2 Planetary system 3 See also 4 References 5 External linksDescription EditThis is a K type main sequence star with a stellar classification of K2 V 3 HD 192310 has about 78 of the Sun s mass 6 and depending on the estimation method 79 to 85 of the radius of the Sun 7 The effective temperature of the photosphere is about 5069 K giving it the orange hued glow of a K type star 10 It is older than the Sun with age estimates in the range 7 5 8 9 billion years 5 The proportion of elements other than hydrogen and helium known as the metallicity is similar to that of the Sun 9 It is spinning slowly completing a rotation roughly every 48 days 8 The space velocity components of this star are U V W 69 13 14 km s It is following an orbit through the Milky Way galaxy that has an orbital eccentricity of 0 18 at a mean galactocentric distance of 8 1 kpc 11 The star will achieve perihelion in around 82 200 years when it comes within 20 18 ly 6 188 pc of the Sun 12 Planetary system EditThe system has a Neptune mass planet b discovered in 2010 13 A second planet c was found in this system in 2011 by the HARPS GTO program along with HD 85512 b and the planets of 82 G Eridani The uncertainty in the mass of the second planet is much higher than for the first because of the lack of coverage around the full orbit Both planets may be similar in composition to Neptune They are orbiting along the inner and outer edges of the habitable zone for this star 8 14 A study in 2023 updated the parameters of these two planets and identified a number of additional radial velocity signals While most of these signals are attributed to stellar activity one is considered a planet candidate If real this third planet would be a super Earth orbiting closer to the star than the two known planets 15 31 The HD 192310 planetary system 8 15 Companion in order from star Mass Semimajor axis AU Orbital period days Eccentricity Inclination Radius unconfirmed 2 46 0 39 0 4 M 24 559 0 016 0 16 0 12 b 14 28 0 64 0 63 M 0 32 0 005 74 278 0 035 0 032 0 027 c 14 96 1 21 1 18 M 1 18 0 025 549 1 4 5 0 078 0 073 See also EditList of star systems within 25 30 light yearsReferences Edit a b c d e Vallenari A et al Gaia Collaboration 2022 Gaia Data Release 3 Summary of the content and survey properties Astronomy amp Astrophysics arXiv 2208 00211 doi 10 1051 0004 6361 202243940 Gaia DR3 record for this source at VizieR a b c Johnson H L et al 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 99 Bibcode 1966CoLPL 4 99J a b Gray R O et al July 2006 Contributions to the Nearby Stars NStars Project Spectroscopy of Stars Earlier than M0 within 40 pc The Southern Sample The Astronomical Journal 132 1 161 170 arXiv astro ph 0603770 Bibcode 2006AJ 132 161G doi 10 1086 504637 S2CID 119476992 Samus N N Durlevich O V et al 2009 VizieR Online Data Catalog General Catalogue of Variable Stars Samus 2007 2013 VizieR On line Data Catalog B GCVS Originally Published in 2009yCat 102025S 1 B gcvs Bibcode 2009yCat 102025S a b c Mamajek Eric E Hillenbrand Lynne A November 2008 Improved Age Estimation for Solar Type Dwarfs Using Activity Rotation Diagnostics The Astrophysical Journal 687 2 1264 1293 arXiv 0807 1686 Bibcode 2008ApJ 687 1264M doi 10 1086 591785 S2CID 27151456 a b Santos N C Israelian G Mayor M July 2001 The metal rich nature of stars with planets Astronomy and Astrophysics 373 3 1019 1031 arXiv astro ph 0105216 Bibcode 2001A amp A 373 1019S doi 10 1051 0004 6361 20010648 S2CID 119347084 a b Pasinetti Fracassini L E et al February 2001 Catalogue of Apparent Diameters and Absolute Radii of Stars CADARS Third edition Comments and statistics Astronomy and Astrophysics 367 2 521 524 arXiv astro ph 0012289 Bibcode 2001A amp A 367 521P doi 10 1051 0004 6361 20000451 S2CID 425754 a b c d e f Pepe F et al 2011 The HARPS search for Earth like planets in the habitable zone VizieR On line Data Catalog J A A 534 A58 vol 534 pp A58 arXiv 1108 3447 Bibcode 2011yCat 35340058P doi 10 1051 0004 6361 201117055 S2CID 15088852 a b c d Ecuvillon A et al May 2004 Nitrogen abundances in planet harbouring stars Astronomy and Astrophysics 418 2 703 715 arXiv astro ph 0401396 Bibcode 2004A amp A 418 703E doi 10 1051 0004 6361 20035717 S2CID 55400558 The Colour of Stars Australia Telescope Outreach and Education Commonwealth Scientific and Industrial Research Organisation December 21 2004 archived from the original on March 18 2012 retrieved 2012 01 16 Porto de Mello Gustavo del Peloso Eduardo F April 2006 Astrobiologically Interesting Stars Within 10 Parsecs of the Sun Astrobiology 6 2 308 331 arXiv astro ph 0511180 Bibcode 2006AsBio 6 308P doi 10 1089 ast 2006 6 308 PMID 16689649 S2CID 119459291 Bailer Jones C A L March 2015 Close encounters of the stellar kind Astronomy amp Astrophysics 575 13 arXiv 1412 3648 Bibcode 2015A amp A 575A 35B doi 10 1051 0004 6361 201425221 S2CID 59039482 A35 Howard Andrew W Johnson John Asher et al March 2011 The NASA UC Eta Earth Program III A Super Earth orbiting HD 97658 and a Neptune mass planet orbiting Gl 785 The Astrophysical Journal 730 1 10 arXiv 1011 0414 Bibcode 2011ApJ 730 10H doi 10 1088 0004 637X 730 1 10 S2CID 17943021 Schneider Jean HD 192310 c Extrasolar Planets Encyclopaedia archived from the original on 2011 11 08 retrieved 2011 10 29 a b Laliotis Katherine Burt Jennifer A et al February 2023 Doppler Constraints on Planetary Companions to Nearby Sun like Stars An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions The Astronomical Journal arXiv 2302 10310 External links Edit CD 27 14659 HR 7722 SolStation Retrieved 2007 05 11 Retrieved from https en wikipedia org w index php title HD 192310 amp oldid 1154755259, wikipedia, wiki, book, books, library,
