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Asteroids with Satellites Database--Johnston's Archive
(85275) 1994 LY
compiled by Wm. Robert Johnston
last updated30 April 2022--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:NEA, Amor
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 1.8901669005 AU | | orbital periodP: | 2.598664602 yr
(= 949.1801723 d) | | eccentricitye: | 0.441921613 | | perihelion distanceq: | 1.054861294 AU | | aphelion distanceQ: | 2.7254725069 AU | | inclinationi: | 17.7184392° | | argument of perihelionω: | 202.811558° | | ascending nodeΩ: | 141.1640441° | | mean anomalyM: | 321.4794939° | | perihelion passageTP: | 2020 Sep 09.5636129 | | Epoch: | 2020 May 31 | | data arc: | 1994-2020(3266 obs.) | | Earth MOID: | 0.0645006 AU | | Jupiter Tisserand invariantTJ: | 3.783 |
orbital data, secondary: | semimajor axisas: | 4.2 km[*E] | | separation/primary radiusas/rp: | 3.4 [*E] | | separation/Hill radiusas/rH: | 0.021 [*E] | | orbital periodPs: | 0.69265± 0.00003d [W20c] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 16.1[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 2.51± 1.18 km [N16c] | | geometric albedo: | 0.093± 0.136[N16c] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 200 km [*E] |
other data, primary: | diameterdp: | 2.44 km [*D] | | rotation periodRPp: | 2.696± 0.00003h [W20c] | | amplitude in mag., rotationalΔM: | 0.1± 0.01 [W20c] | | amplitude in mag., mutual eventsΔM: | 0.08 ±0.01 [W20c] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | >0.59km [*D] | | diameter ratiods/dp: | >0.24± 0.02 [W20c] | | component mag. differenceΔM: | <3.1 [*D] | | rotation periodRPs: | ? | |
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--(85275) 1994 LY --discovery and notes:
Primary discovered1994 Jun 11from Palomar Observatory, California, USAby E. F. Helin.Linked to prediscovery observations from 1994 Jun 05.Permanent number assigned 2004 Aug 30.
Companion discovered2020 Jul 01 by B. D. Warner, R. D. Stephens, and A. W. Harrisusinglightcurve observations from Center for Solar System Studies, Landers, California, USA.Announced2020 Sep [W20c].
--Links, more technical:
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--Links to ADS abstracts:
©2020, 2022by Wm. Robert Johnston.
Last modified30 April 2022Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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