| 词条 | (139775) 2001 QG298 |
| 释义 |
| bgcolour=#C2E0FF | name={{mp|(139775) 2001 QG|298}} | discoverer=Marc William Buie | discovered=August 19, 2001 | mpc_name={{mp|(139775) 2001 QG|298}} | alt_names= | mp_category=Plutino (MPC) | orbit_ref=[2] | epoch=2016-Jan-13.0 (JD 2457400.5) | semimajor=39.200 AU | perihelion=31.758 AU | aphelion=46.642 AU | eccentricity=0.190 | period=245.43 a (89,645.031 d) | inclination=6.500 ° | asc_node=162.610° | arg_peri=309.327° | mean_anomaly=7.386° | dimensions=122 km[3] | mass= | density=0.6–0.7 g/cm3[4] | surface_grav= | escape_velocity= | sidereal_day= 13.7744 ± 0.0004 h[3] | spectral_type= V−R=0.60 ± 0.02, B−V=1.00 ± 0.04[3] | abs_magnitude=6.85[3] | albedo=0.04 (assumed)[3] | single_temperature= }}{{mp|(139775) 2001 QG|298}} is a trans-Neptunian object (TNO) that resides in the Kuiper belt and was discovered on August 19, 2001 by Marc William Buie at Cerro Tololo Observatory.[2] It is classified as a plutino, which means that it is in the 3:2 mean motion resonance with Neptune. Physical properties{{mp|(139775) 2001 QG|298}} is a small plutino occupying the 3:2 mean motion resonance with Neptune. Its size is estimated at 122 km assuming a comet-like albedo of about 4%.[3]{{mp|(139775) 2001 QG|298}} has a double peaked light curve with a large amplitude, which has changed from 1.14 in 2003 to 0.7 in 2010. This large amplitude implies that it is actually a contact binary consisting of two elongated components of approximately equal size viewed from almost the equatorial perspective. The size of the components separated by the distance of approximately 300 km will be then about 95 km each. The density of {{mp|(139775) 2001 QG|298}} should be at least 0.6–0.7 g/cm3 for it to remain bound.[3][4]References1. ^1 2 {{Cite web |type=2010-10-04 last obs. |title=JPL Small-Body Database Browser: 139775 (2001 QG298) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001+QG298 |accessdate=2016-02-24}} [1][2][3]2. ^1 2 3 4 5 6 7 {{Cite journal|title= Extreme Kuiper Belt Object 2001 QG298 and the Fraction of Contact Binaries|author= Scott S. Sheppard|author2= David C. Jewitt|year=2004|journal=The Astronomical Journal|bibcode = 2004AJ....127.3023S |doi = 10.1086/383558|volume=4127|issue=5|pages= 3023–3033|arxiv = astro-ph/0402277 }} 3. ^1 2 {{Cite journal|title= A Change in the Lightcurve of Kuiper Belt Contact Binary (139775) 2001 QG298|author= Pedro Lacerda|year=2011|journal=The Astronomical Journal|arxiv = 1107.3507 |doi = 10.1088/0004-6256/142/3/90|volume=142|pages= 90|bibcode = 2011AJ....142...90L }} }} External links
4 : Plutinos|Discoveries by Marc W. Buie|Binary trans-Neptunian objects|Astronomical objects discovered in 2001 |
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