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Asteroids with Satellites Database--Johnston's Archive
(148780) Altjira
compiled by Wm. Robert Johnston
last updated20 September 2014--Orbital and physical data--
(Seethis page for definitions of quantities; source codes in brackets, seethis link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:TNO, Cubewano
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 44.4009 AU | | orbital periodP: | 295.867 yr
(= 108065.4 d) | | eccentricitye: | 0.05814 | | perihelion distanceq: | 41.819 AU | | aphelion distanceQ: | 46.9826 AU | | inclinationi: | 5.20380° | | argument of perihelionω: | 301.36° | | ascending nodeΩ: | 1.9671° | | mean anomalyM: | 118.61° | | perihelion passageTP: | 1916 Nov 28 | | Epoch: | 2014 May 23 | | data arc: | 2001-2008(70 obs.) | | Earth MOID: | 40.8064 AU | | Jupiter Tisserand invariantTJ: | 5.926 | | Neptune Tisserand invariantTN: | 3.09 [*D] |
orbital data, secondary: | semimajor axisas: | 9904± 56 km[G11a] | | separation/primary radiusas/rp: | 81 [*D] | | separation/Hill radiusas/rH: | 0.018 [*D] | | orbital periodPs: | 139.561± 0.047d [G11a] | | eccentricityes: | 0.3445± 0.0045[G11a] | | inclinationis: | 35.19° ± 0.19° [G11a] | | ascending nodeΩs: | 312.73° ± 0.31° [G11a] | | argument of pericenterωs: | 101.96° ± 0.91° [G11a] | | mean anomalyM: | 224.89° ± 0.16° [G11a] | | Epoch: | 2007 Jul 18.5 | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 5.7[MPC]
6.44 ± 0.14 [V14a] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 331± 51/187 km [V14a] | | geometric albedo: | 0.043± 0.182/0.01[V14a] | | color indexU-B: | ? | | color indexB-V: | 0.91[D05a] | | color indexV-R: | 0.74 ± 0.08 [D05a] | | color indexB-R: | 1.65 [D05a] | | color indexV-I: | 1.17 ± 0.09 [D05a] | | taxonomic type: | ? | | massm: | 3.99x1018 ± 6.7x1016kg [G11a] | | densityρ: | 0.3± 0.5/0.14 g/cm3[V14a] | | Hill radiusrH: | 550000 km [*D] |
other data, primary: | diameterdp: | 246± 38/139 km [V14a] | | color indexV-I: | 1.3 ± 0.16 [B08d] | | rotation periodRPp: | ? | | amplitude in mag., rotationalΔM: | <0.3 [T14a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 221± 34/125km [V14a] | | diameter ratiods/dp: | 0.899 [G11a] | | component mag. differenceΔM: | 0.7± 0.2 [N08c] | | color indexV-I: | 1.39± 0.17 [B08d] | | rotation periodRPs: | ? | |
|
--(148780) Altjira --discovery and notes:
Primary discovered2001 Oct 20from Kitt Peak Observatory, Arizona, USAby Deep Ecliptic Survey.Alternate designation(s):2001 UQ18.Permanent number assigned 2007 Feb 02.
Named 2008 Jul 18 for the mythological Aboriginal god of the sky [MPC63642].
Companion discovered2006 Aug 06usingHubble Space Telescope observations from Hubble Space Telescope.Announced2007 Mar 14.
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
- Grundy, W. M., Noll, K. S., Nimmo, F., Roe, H. G., Buie, M. W., Porter, S. B., Benecchi, S. D., Stephens, D. C., Levison, H. F., & Stansberry, J. A. 2011, IcarusFive new and three improved mutual orbits of transneptunian binaries
- Sheppard, Scott S. 2007, The Astronomical JournalLight Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions, and Absolute Magnitudes
- Noll, Keith S., Grundy, William M., Chiang, Eugene I., Margot, Jean-Luc, & Kern, Susan D. 2007, ArXiv Astrophysics e-printsBinaries in the Kuiper Belt
- Sheppard, Scott S. 2007, ArXiv e-printsLight Curves of Dwarf Plutonian Planets and other Large Kuiper Belt Objects: Their Rotations, Phase Functions and Absolute Magnitudes
- Elliot, J. L., Kern, S. D., Washburn, K. E., Buie, M. W., Wasserman, L. H., Millis, R. L., & Marsden, B. G. 2001, Minor Planet Electronic Circulars2001 UN18,
©2007-2012, 2014by Wm. Robert Johnston.
Last modified20 September 2014.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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