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Asteroids with Satellites Database--Johnston's Archive
(4788) Simpson
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:main belt asteroid
orbital data, primary (osculating elements)[JPL]: | semimajor axisa: | 2.2626167213 AU | | orbital periodP: | 3.4034273812 yr
(= 1243.1253289 d) | | eccentricitye: | 0.129443116 | | perihelion distanceq: | 1.969736563 AU | | aphelion distanceQ: | 2.5554968799 AU | | inclinationi: | 4.3187853° | | argument of perihelionω: | 110.318461° | | ascending nodeΩ: | 277.176547° | | mean anomalyM: | 316.513479° | | perihelion passageTP: | 2020 Oct 28.164432 | | Epoch: | 2020 May 31 | | data arc: | 1976-2020(2088 obs.) | | Earth MOID: | 0.979429 AU | | Jupiter Tisserand invariantTJ: | 3.604 |
orbital data, secondary: | semimajor axisas: | 5.7 km[*E] | | separation/primary radiusas/rp: | 3.2 [*E] | | separation/Hill radiusas/rH: | 0.011 [*E] | | orbital periodPs: | 0.6242± 0.0004d [S21a] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13.7[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 3.58± 0.70 km [M12b] | | geometric albedo: | 0.500± 0.174[M12b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 540 km [*E] |
other data, primary: | diameterdp: | 3.53 km [*D] | | rotation periodRPp: | 2.81752± 0.00008h [S21a] | | amplitude in mag., rotationalΔM: | 0.18 [S21a] | | amplitude in mag., mutual eventsΔM: | 0.05 ±0.02 [S21a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | >0.6km [*D] | | diameter ratiods/dp: | >0.17 [S21a] | | component mag. differenceΔM: | <3.8 [S21a] | | rotation periodRPs: | ? | |
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--(4788) Simpson --discovery and notes:
Primary discovered1986 Oct 04from Flagstaff, Arizonaby E. Bowell.Alternate designation(s):1986 TL1, 1976 YJ1, 1979 RN1, 1984 AS.Linked to prediscovery observations from 1976 Dec 16.Permanent number assigned 1991 Apr 28.
Named 1991 Jun 27 for Robert W. L. Simpson (1921-1997) [MPC018465].
Companion discovered2020 Dec by P. Sogorb, et al.usinglightcurve observations.Announced2021 Jan 07 [S21a].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©2021, 2022by Wm. Robert Johnston.
Last modified30 April 2022.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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