2007 TG422
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2007 TG422
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Discovery[1]
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| Discovered by | SDSS Collaboration A. C. Becker, A. W. Puckett, J. Kubica Apache Point (705) |
| Discovery date | 2007-10-03 |
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Designations
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| MPC designation | 2007 TG422 |
| Minor planet category |
SDO[2] |
| Epoch 2011-Feb-08 | |
| Aphelion | 967 AU (Q)[4][a] (Heliocentric 1087 AU) |
| Perihelion | 35.560 AU (q) |
| Semi-major axis | 501 AU (a)[4][a] (Heliocentric 561.4 AU) |
| Eccentricity | 0.9366 |
| Orbital period | 11,200 yr[4][a] (Heliocentric 13304 yr) |
| Mean anomaly | 0.143° (M) |
| Inclination | 18.59° |
| Longitude of ascending node | 112.8° |
| Argument of perihelion | 285.6° |
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Physical characteristics
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| Dimensions | 160–360 km[3][5] 270 km[6][7] |
| Apparent magnitude | ~21.8[8] |
| Absolute magnitude (H) | 6.1[3] |
2007 TG422, also written as 2007 TG422, is a scattered-disc object with a perihelion distance of 35.5 AU, which is just inside the influence of Neptune[2], and an aphelion distance similar to Sedna's.
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Contents
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Orbit
2007 TG422 came to perihelion in 2005 at a heliocentric distance of 35.5 AU,[3] and is currently 36.0 AU from the Sun.[8]
Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the aphelion distance (maximum distance) of this object.[b] With a 2007 epoch the object had an approximate period of about 10,611 years with aphelion at 930 AU.[2] But using a 2011 epoch shows a period of about 13,304 years with aphelion at 1087 AU.[3] For objects at such high eccentricity, the Suns barycentric coordinates are more stable than heliocentric coordinates.[9] Using JPL Horizons with an observed orbital arc of only 2 years, the barycentric orbital elements for epoch 2008-May-14 generate a semi-major axis of 501 AU and a period of 11,200 years.[4] For comparison dwarf-planet candidate Sedna has a barycentric semi-major axis of 506 AU and a period of 11,400 years.[4] Both 2010 EC46, 2006 SQ372 and (87269) 2000 OO67 take longer than Sedna and 2007 TG422 to orbit the Sun using barycentric coordinates.
2007 TG422 has only been observed 32 times over two years and has an uncertainty parameter of 1.[3]
Assuming a generic trans-Neptunian albedo of 0.09, 2007 TG422 is about 270 km in diameter.[6] But since the true albedo is unknown and it has an absolute magnitude (H) of 6.1,[3] it could be anywhere from about 160 to 360 km in diameter.[5]
See also
- (87269) 2000 OO67
- 2002 RN109
- 2005 VX3
- (308933) 2006 SQ372
- 2010 EC46
Notes
- ^ Solution using the Solar System's barycenter
- ^ Read osculating orbit for more details about heliocentric unperturbed two-body solutions
References
- ^ "MPEC 2008-D39: 2007 TG422, 2007 TH422, 2007 TJ422, 2007 UL126, 2007 VH305". IAU Minor Planet Center. 2008-02-26. http://minorplanetcenter.org/mpec/K08/K08D39.html. Retrieved 2011-01-30. K07Tg2G
- ^ a b c Marc W. Buie (2009-09-28 using 32 of 32 observations). "Orbit Fit and Astrometric record for 07TG422". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/07TG422.html. Retrieved 2011-01-30.
- ^ a b c d e f g "JPL Small-Body Database Browser: (2007 TG422)". 2009-09-28 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007TG422. Retrieved 2011-01-30.
- ^ a b c d e Horizons output (2011-01-30). "Barycentric Osculating Orbital Elements for 2007 TG422". http://home.surewest.net/kheider/astro/2007TG422Barycenter.txt. Retrieved 2011-01-30. (Horizons)
- ^ a b "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. http://neo.jpl.nasa.gov/glossary/h.html. Retrieved 2009-12-06.
- ^ a b Dan Bruton. "Conversion of Absolute Magnitude to Diameter for Minor Planets". Department of Physics & Astronomy (Stephen F. Austin State University). http://www.physics.sfasu.edu/astro/asteroids/sizemagnitude.html. Retrieved 2011-01-30.
- ^ Assuming an albedo of 0.09
- ^ a b "AstDys 2007TG422 Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=2007TG422. Retrieved 2011-05-08.
- ^ Kaib, Nathan A.; Becker, Andrew C.; Jones, R. Lynne; Puckett, Andrew W.; Bizyaev, Dmitry; Dilday, Benjamin; Frieman, Joshua A.; Oravetz, Daniel J.; Pan, Kaike; Quinn, Thomas; Schneider, Donald P.; Watters, Shannon (2009). "2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud". The Astrophysical Journal 695 (1): 268–275. arXiv:0901.1690. Bibcode 2009ApJ...695..268K. doi:10.1088/0004-637X/695/1/268.
External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
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