| 词条 | G 99-47 | ||||||||||||||||||
| 释义 |
|name= G 99-47 }}{{Starbox observe |epoch=J2000[1] |equinox=J2000[1] |constell=Orion |ra={{RA|05|56|25.47}}[1] |dec={{DEC|+05|21|48.6}}[1] |appmag_v=14.105[2]}}{{Starbox character |class=DAP8.9[3] |appmag_1_passband=B |appmag_1=14.69[1] |appmag_2_passband=V |appmag_2=14.10[1] |appmag_3_passband=R |appmag_3=14.0[1] |appmag_4_passband=I |appmag_4=13.6[1] |appmag_5_passband=J |appmag_5=12.930 ± 0.022[1] |appmag_6_passband=H |appmag_6=12.720 ± 0.025[1] |appmag_7_passband=K |appmag_7=12.653 ± 0.024[1]}}{{Starbox astrometry |prop_mo_ra=-434[3] |prop_mo_dec=-931[3] |parallax=125.0 |p_error=3.6 |parallax_footnote=[4] | absmag_v=14.59[2][4][5]}}{{Starbox detail | mass=0.71 ± 0.03[2] | gravity=8.20 ± 0.05[2] | radius=0.011[2][6] | temperature=5790 ± 110[2] | age_gyr=3.97[3][7]}}{{Starbox catalog |names=WD 0553+053,[2][3] V1201 Ori,[1] LHS 212,[2] LTT 17891,[1] NLTT 15834,[1] G 099-047,[4] GJ 1087,[1] G 102-40,[1] G 106-15,[1] EGGR 290,[1] 2MASS J05562547+0521486,[1] USNO-B1.0 0953-00073703[1]}}{{Starbox reference | Simbad=GJ+1087 }}{{Starbox end}} G 99-47 (V1201 Orionis) is a nearby degenerate star (white dwarf) of spectral class DAP8 (DAP8.9,[3] or DAP8.7[2]), the single known component of the system, located in the constellation Orion. DistanceG 99-47 is probably the tenth closest white dwarf (or possibly the 9th–12th: see Gliese 293, Gliese 518 and Gliese 915). Its trigonometric parallax from the Yale Parallax Catalog is 0.1250 ± 0.0036 arcsec,[4] corresponding to a distance 8.00 ± 0.23 pc, or 26.09 ± 0.75 ly.
Physical parametersG 99-47's mass is 0.71 ± 0.03 Solar masses;[2] its surface gravity is 108.20 ± 0.05 (1.58 · 108) cm·s−2,[2] or approximately 162 000 of Earth's, corresponding to a radius 7711 km, or 121% of Earth's. Its temperature is 5790 ± 110 K,[2] almost like the Sun's; its cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) is 3.97 Gyr.[3] Due almost equal to the Sun's temperature, GJ 1087 should appear almost the same color as the Sun. Notes1. ^1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 {{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=GJ+1087 | title =V* V1201 Ori -- White Dwarf | publisher=Centre de Données astronomiques de Strasbourg | accessdate=2011-11-01}} 2. ^1 2 3 4 5 6 7 8 9 10 11 {{cite journal | last=Holberg |first=J. B. |author2=Sion |author3=Oswalt |author4=McCook |author5=Foran |author6= Subasavage | date=2008 | title=A NEW LOOK AT THE LOCAL WHITE DWARF POPULATION | journal=The Astronomical Journal | volume=135 | pages=1225–1238 | bibcode=2008AJ....135.1225H | doi=10.1088/0004-6256/135/4/1225}} 3. ^1 2 3 4 5 6 {{cite journal | last=Sion |first=Edward M. |author2=Holberg |author3=Oswalt |author4=McCook |author5= Wasatonic | date=2009 | title=THE WHITE DWARFS WITHIN 20 PARSECS OF THE SUN: KINEMATICS AND STATISTICS | journal=The Astronomical Journal | volume=138 | pages=1681–1689 | bibcode=2009AJ....138.1681S | doi=10.1088/0004-6256/138/6/1681|arxiv = 0910.1288 }} 4. ^1 2 3 4 Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995) 5. ^From apparent magnitude and parallax. 6. ^From surface gravity and mass. 7. ^White dwarf cooling age, i. e. age as degenerate star (not including lifetime as main sequence star and as giant star) 8. ^Nearby Stars, Preliminary 3rd Version (Gliese+ 1991) See also
References 5 : White dwarfs|Orion (constellation)|Gliese and GJ objects|Objects with variable star designations|2MASS objects |
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