| 词条 | DENIS J082303.1-491201 |
| 释义 |
|epoch=J2000 |constell=Vela |ra={{RA|08|23|03.13}}[1] |dec={{DEC|-49|12|01.3}}[1] |appmag_v= }}{{Starbox character |appmag_1_passband=R |appmag_1=20.020[2] |class=L1.5 + L5.5[3] }}{{Starbox astrometry |prop_mo_ra=−154.92[3] |prop_mo_dec=7.99[3] |dist_pc=20.69 ± 0.06[3] |dist_ly={{cvt|20.69|±|0.06|pc|ly|disp=number}} }}{{Starbox orbit |reference=[4] |period_unitless=247.75 ± 0.64 d |axis=4.62 ± 0.12 mas |inclination=52.2 ± 1.5 |node=346.2 ± 2.0 |periastron=JD 2455927.323928 |eccentricity=0.36 ± 0.04 |periarg=41.8 ± 4.7 }}{{Starbox detail |source=[3] |component1=A |mass=0.028−0.063 |temperature=2150 ± 100 |luminosity=0.00018 |age_myr=80–500 |component2=B |mass2=0.018−0.045 |temperature2=1670 ± 140 |luminosity2=0.000063 }}{{Starbox catalog |names={{odlist|2MASS=J08230313-4912012}}[2] }}{{Starbox reference |Simbad=2MASS+J08230313-4912012 }}{{Starbox end}} DENIS-P J082303.1-491201 (also known as DENIS J082303.1-491201, DE0823-49), is a binary system of two brown dwarfs, located {{convert|20.77|pc|ly}} away from the Earth. The system is located in the constellation Vela. The primary has a spectral class of L1.5, a mass of {{solar mass|0.028 to 0.063}} and a temperature of {{convert|2150|K|C F}}. The secondary is also a brown dwarf but with a spectral type of L5.5, a mass of {{solar mass|0.018 to 0.045}}, and a temperature of {{convert|1670|K|C F}}. The mass ratio is around 0.64 to 0.74.[3] The system has an orbital period of 248 days. The age of the system is estimated to be around 80 to 500 millions years old, a relatively young object in the solar neighbourhood, however it does not seem to belong to have any association with any moving groups.[3] HistoryDENIS J082303.1-491201 was discovered by Ngoc Phan-Bao et al as part of the Deep Near Infrared Survey of the Southern Sky or DENIS for short.[5] Detected in 2006, DE0823-49 b was included in the NASA Exoplanet Archive as the first exoplanet discovered by the Astrometry exoplanet detection method.[6][7] References1. ^1 {{cite journal|title=2MASS All-Sky Catalog of Point Sources|date=2003|journal=VizieR On-line Data Catalog|author=Cutri, R. M.|display-authors=etal|bibcode=2003yCat.2246....0C}} {{Stars of Vela}}2. ^1 {{cite simbad|title=2MASS J08230313-4912012|accessdate=19 September 2017}} 3. ^1 2 3 4 5 6 {{cite journal|doi=10.1051/0004-6361/201425536|title=DE0823−49 is a juvenile binary brown dwarf at 20.7 pc|arxiv=1505.07972|bibcode=2015A&A...579A..61S}} 4. ^{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|accessdate=19 September 2017}} 5. ^{{cite journal|first=Ngoc|last=Phan-Bao|author-link=|display-authors=etal|title=Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS data base|publisher=Monthly Notices of the Royal Astronomical Society|volume=383|number=3|date=January 2008|pages=831–844|doi=10.1111/j.1365-2966.2007.12564.x|bibcode=2008MNRAS.383..831P|arxiv=0708.4169|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-iarticle_query?2008MNRAS.383..831P&classic=YES|format=gif|access-date=1 June 2015 }}. 6. ^{{cite web|title=Exoplanet and candidate statistics|url=http://exoplanetarchive.ipac.caltech.edu/docs/counts_detail.html|work=NASA Exoplanet Archive|accessdate=1 June 2015}} 7. ^{{cite web|title=Liste des exoplanètes découvertes par astrométrie|url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=planets&constraint=pl_discmethod+like+%27Astrometry%25%27|work=NASA Exoplanet Archive|accessdate=1 June 2015}} 5 : Brown dwarfs|L-type stars|Binary stars|2MASS objects|Vela (constellation) |
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