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Asteroids with Satellites Database--Johnston's Archive
(469509) 2003 HC57
compiled by Wm. Robert Johnston
last updated9 October 2021--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: | 44.0336 AU | | orbital periodP: | 292.203 yr
(= 106727.1 d) | | eccentricitye: | 0.069749 | | perihelion distanceq: | 40.96229 AU | | aphelion distanceQ: | 47.1049 AU | | inclinationi: | 1.037789° | | argument of perihelionω: | 47.042° | | ascending nodeΩ: | 233.9975° | | mean anomalyM: | 306.698° | | perihelion passageTP: | 2064 Oct 05.1 | | Epoch: | 2021 Jul 01 | | data arc: | 2003-2021(284 obs.) | | Earth MOID: | 39.9457 AU | | Jupiter Tisserand invariantTJ: | 5.921 | | Neptune Tisserand invariantTN: | 3.09683770469186 [*D] |
orbital data, secondary: | semimajor axisas: | 1960± 70 km (separation) [G20a] | | separation/primary radiusas/rp: | 19 [*E] | | separation/Hill radiusas/rH: | 0.0029 [*E] | | orbital periodPs: | 8.4d [*E] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 5.96[MPC]
6.1 ± 0.5 [G20a] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 283 km [*E] | | geometric albedo: | (0.09) [*A] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1 g/cm3) [*A] | | Hill radiusrH: | 690000 km [*E] |
other data, primary: | diameterdp: | 205 km [*E] | | rotation periodRPp: | ? | | amplitude in mag., rotationalΔM: | ? | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 195km [*E] | | diameter ratiods/dp: | 0.95 [*D] | | component mag. differenceΔM: | 0.1 [G20a] | | rotation periodRPs: | ? | |
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--(469509) 2003 HC57 --discovery and notes:
Primary discovered2003 Apr 26from Mauna Kea Observatory, Hawaii, USAby ?.Permanent number assigned 2016 Aug 18.
Companion discovered2020 Jun 02 by A. H. Parker, et al., and the Solar System Origins Legacy SurveyusingHubble Space Telescope observations from Hubble Space Telescope.Announced2020 Jul [G20a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©2020, 2021by Wm. Robert Johnston.
Last modified9 October 2021.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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