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Asteroids with Satellites Database--Johnston's Archive
2015 RT245
compiled by Wm. Robert Johnston
last updated15 December 2019--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: | 44.392 AU | | orbital periodP: | 295.772 yr
(= 108033 d) | | eccentricitye: | 0.086527 | | perihelion distanceq: | 40.551 AU | | aphelion distanceQ: | 48.2331 AU | | inclinationi: | 0.9534° | | argument of perihelionω: | 342.36° | | ascending nodeΩ: | 330.147° | | mean anomalyM: | 49.87° | | perihelion passageTP: | 1978 May 07 | | Epoch: | 2019 Apr 27 | | data arc: | 2013-2017(65 obs.) | | Earth MOID: | 39.536 AU | | Jupiter Tisserand invariantTJ: | 5.936 | | Neptune Tisserand invariantTN: | 3.09799536568756 [*D] |
orbital data, secondary: | semimajor axisas: | 14680± 60 km (separation) [G19c] | | separation/primary radiusas/rp: | 180 [*E] | | separation/Hill radiusas/rH: | 0.025 [*E] | | orbital periodPs: | 250d [*E] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 6.5[MPC]
7.1 ± 0.5 [G19c] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 222 km [*E] | | geometric albedo: | (0.09) [*A] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1 g/cm3) [*A] | | Hill radiusrH: | 580000 km [*E] |
other data, primary: | diameterdp: | 161 km [*E] | | rotation periodRPp: | ? | | amplitude in mag., rotationalΔM: | ? | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 153km [*E] | | diameter ratiods/dp: | 0.95 [*D] | | component mag. differenceΔM: | 0.1 [G19c] | | rotation periodRPs: | ? | |
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-- 2015 RT245 --discovery and notes:
Primary discovered2015 Sep 08from Mauna Kea Observatory, Hawaii, USAby Solar System Origins Legacy Survey (A. H. Parker et al.).Linked to prediscovery observations from 2013 Oct 12.
Companion discovered2019 Sep 02 by Solar System Origins Legacy Survey (A. H. Parker et al.)usingHubble Space Telescope observations from Hubble Space Telescope.Announced2019 Nov 05 [G19c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©2019by Wm. Robert Johnston.
Last modified15 December 2019.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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