| 词条 | LP 658-2 | ||||||||||||||||||||||||
| 释义 |
| name = LP 658-2 }}{{Starbox observe | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Orion | ra = {{RA|05|55|09.53}}[1] | dec = {{DEC|−04|10|07.1}}[1] | appmag_v=14.488[2] }}{{Starbox character | class = DZ11.8[2] | appmag_1_passband=B | appmag_1=15.49[1] | appmag_2_passband=V | appmag_2=14.488[2] | appmag_3_passband=RKC | appmag_3=13.99[3] | appmag_4_passband=IKC | appmag_4=13.51[3] | appmag_5_passband=J | appmag_5=13.05 ± 0.03[3] | appmag_6_passband=H | appmag_6=12.86 ± 0.03[3] | appmag_7_passband=KS | appmag_7=12.78 ± 0.03[3] | b-v = 1.0[1][2] }}{{Starbox astrometry | prop_mo_ra = 551[3] | prop_mo_dec = −2311[3] | parallax =156.13 | p_error =0.84 | parallax_footnote =[3] | absmag_v=15.44 ± 0.03[3]}}{{Starbox detail | mass=0.45 ± 0.01,[2] or 0.80 ± 0.01[3] | gravity=7.80 ± 0.02,[2] or 8.35 ± 0.01[3] | radius=0.014,[2][4] or 0.010[3] | temperature=4270 ± 70,[2] or 5180 ± 70[3] | age_gyr=6.42,[5] or 6.82 ± 0.02[3][6]}}{{Starbox catalog | names=GJ 223.2, GJ 9193, HL 4, LHS 32, LP 658-2, NLTT 15811, G 099-044[7] , G 99-44, G 106-12, WD 0552–041, EGGR 45.[1] }}{{Starbox reference | Simbad=GJ+223.2 }}{{Starbox end}}LP 658-2 is a degenerate (white dwarf) star in the constellation of Orion,[1] the single known object in its system. It has an apparent visual magnitude of approximately 14.488.[2] DistanceAccording to a 2009 paper, it is the eighth closest known white dwarf to the Sun (after Sirius B, Procyon B, van Maanen's star, Gliese 440, 40 Eridani B, Stein 2051 B and GJ 1221).[8] Its trigonometric parallax from the CTIOPI (Cerro Tololo Inter-American Observatory (CTIO) Parallax Investigation) 0.9 m telescope program, published in 2009, is 0.15613 ± 0.00084 arcsec,[3] corresponding to a distance 6.40 ± 0.03 pc, or 20.89 ± 0.11 ly. Also, previous less precise parallax measurements of LP 658-2 present in YPC (Yale Parallax Catalog) and among results of CTIOPI 1.5 m telescope program: LP 658-2 parallax measurements
Physical parametersThere are two sets of published physical parameters of LP 658-2, significantly differing from each other: one from {{harvnb|Holberg|Sion|Oswalt|McCook|2008}} and {{harvnb|Sion|Holberg|Oswalt|McCook|2009}}, the other from {{harvnb|Subasavage|Jao|Henry|Bergeron|2009}}. Holberg et al. 2008 / Sion et al. 2009 version
Subasavage et al. 2009 version
ColorDespite it being classified as a "white" dwarf, it appears orange rather than white, due to its relatively temperature, comparable with that of late (according Holberg et al. 2008 / Sion et al. 2009 version), or early (according Subasavage et al. 2009 version) K-type main sequence stars. Notes1. ^1 2 3 4 5 {{cite simbad|title=GJ 223.2|accessdate=2011-01-17}} 2. ^1 2 3 4 5 6 7 8 {{cite journal |last1=Holberg |first1=J. B. |last2=Sion |first2=E. M. |last3=Oswalt |first3=T. |last4=McCook |first4=G. P. |last5=Foran |first5=S. |last6=Subasavage |first6=John P. |title=A new look at the local white dwarf population |journal=The Astronomical Journal |date=1 April 2008 |volume=135 |issue=4 |pages=1225–1238 |bibcode=2008AJ....135.1225H |doi=10.1088/0004-6256/135/4/1225 |ref=harv}} 3. ^1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 {{cite journal |last1=Subasavage |first1=John P. |last2=Jao |first2=Wei-Chun |last3=Henry |first3=Todd J. |last4=Bergeron |first4=P. |last5=Dufour |first5=P. |last6=Ianna |first6=Philip A. |last7=Costa |first7=Edgardo |last8=Méndez |first8=René A. |title=The solar neighborhood. XXI. Parallax results from the CTIOPI 0.9 m program: 20 new members of the 25 parsec white dwarf sample |journal=The Astronomical Journal |date=1 June 2009 |volume=137 |issue=6 |pages=4547–4560 |bibcode=2009AJ....137.4547S |doi=10.1088/0004-6256/137/6/4547 |ref=harv|arxiv=0902.0627 }} 4. ^1 2 From surface gravity and mass. 5. ^{{cite journal |last1=Sion |first1=Edward M. |last2=Holberg |first2=J. B. |last3=Oswalt |first3=Terry D. |last4=McCook |first4=George P. |last5=Wasatonic |first5=Richard |title=The white dwarfs within 20 parsecs of the Sun: kinematics and statistics |journal=The Astronomical Journal |date=1 December 2009 |volume=138 |issue=6 |pages=1681–1689 |arxiv=0910.1288 |bibcode=2009AJ....138.1681S |doi=10.1088/0004-6256/138/6/1681 |ref=harv}} 6. ^1 2 White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) 7. ^1 {{cite book |last1=van Altena |first1=W. F. |last2=Lee |first2=J. T. |last3=Hoffleit |first3=E. D. |title=The General Catalogue of Trigonometric [Stellar] Parallaxes |date=1995 |publisher=Yale University Observatory |location=New Haven, CT |edition=4th |bibcode=1995gcts.book.....V}} VizieR entry. 8. ^Table 1 in {{harvnb|Sion|Holberg|Oswalt|McCook|2009}} 9. ^{{cite journal |last1=Costa |first1=Edgardo |last2=Méndez |first2=René A. |last3=Jao |first3=W.-C. |last4=Henry |first4=Todd J. |last5=Subasavage |first5=John P. |last6=Brown |first6=Misty A. |last7=Ianna |first7=Philip A. |last8=Bartlett |first8=Jennifer |title=The solar neighborhood. XIV. Parallaxes from the Cerro Tololo Inter-American Observatory Parallax Investigation—First results from the 1.5 m telescope program |journal=The Astronomical Journal |date=July 2005 |volume=130 |issue=1 |pages=337–349 |bibcode=2005AJ....130..337C |doi=10.1086/430473}} References 3 : Orion (constellation)|White dwarfs|Gliese and GJ objects |
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