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Asteroids with Satellites Database--Johnston's Archive
(399307) 1991 RJ2
compiled by Wm. Robert Johnston
last updated17 January 2015--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: | 2.2083582416 AU | | orbital periodP: | 3.281740899 yr
(= 1198.6785019 d) | | eccentricitye: | 0.428903368 | | perihelion distanceq: | 1.26118595 AU | | aphelion distanceQ: | 3.1555305285 AU | | inclinationi: | 8.9433021° | | argument of perihelionω: | 150.817669° | | ascending nodeΩ: | 171.820039° | | mean anomalyM: | 37.125057° | | perihelion passageTP: | 2014 Aug 07.386090 | | Epoch: | 2014 Dec 09 | | data arc: | 1991-2014(206 obs.) | | Earth MOID: | 0.262188 AU | | Jupiter Tisserand invariantTJ: | 3.519 |
orbital data, secondary: | semimajor axisas: | 0.86 km[*E] | | separation/primary radiusas/rp: | 3.4 [*E] | | separation/Hill radiusas/rH: | 0.017 [*E] | | orbital periodPs: | 0.66321± 0.00004d [W15b] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 18.9[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 0.55 km [*E] | | geometric albedo: | (0.16) [*A] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 51 km [*E] |
other data, primary: | diameterdp: | 0.5 km [*E] | | rotation periodRPp: | 3.4907± 0.0002h [W15b] | | amplitude in mag., rotationalΔM: | 0.09 [W15b] | | amplitude in mag., mutual eventsΔM: | 0.35 [W15b] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 0.24km [*E] | | axial ratiosa/b, b/c: | 1.07;? [W15b] | | diameter ratiods/dp: | >0.47± 0.02 [W15b] | | component mag. differenceΔM: | <1.64 [*D] | | rotation periodRPs: | 15.917± 0.001h [W15b] | |
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--(399307) 1991 RJ2 --discovery and notes:
Primary discovered1991 Sep 08from Palomar Observatory, California, USAby E. F. Helin.Permanent number assigned 2014 Jul 12.
Companion discovered2014 Aug 27 by B. D. Warner, J. T. Pollock, D. E. Reichart, J. B. Haislip, A. P. LaCluyze, A. Verveer, T. Spuck, A. W. Harrisusinglightcurve observations from Palmer Divide Observatory, Colorado Springs, Colorado, USA; PROMPT Telescope, Chile; Perth Observatory, Australia.Announced2014 Dec [W15b].
--Links, more technical:
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--Links to ADS abstracts:
©2015, 2014by Wm. Robert Johnston.
Last modified17 January 2015.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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