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Asteroids with Satellites Database--Johnston's Archive
(6181) Bobweber
compiled by Wm. Robert Johnston
last updated16 July 2017--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: | 2.430241592 AU | | orbital periodP: | yr
(= 1383.797688 d) | | eccentricitye: | 0.23877596 | | perihelion distanceq: | 1.84995832 AU | | aphelion distanceQ: | 3.01052486 AU | | inclinationi: | 7.569039° | | argument of perihelionω: | 93.589287° | | ascending nodeΩ: | 303.653205° | | mean anomalyM: | 30.628487° | | perihelion passageTP: | 2017 May 09.267696 | | Epoch: | 2017 Sep 04 | | data arc: | 1954-2016(1077 obs.) | | Earth MOID: | 0.87563 AU | | Jupiter Tisserand invariantTJ: | 3.457 |
orbital data, secondary: | semimajor axisas: | ? | | orbital periodPs: | ? | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 13.6[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 4.49± 0.05 km [M11b] | | geometric albedo: | 0.421± 0.045[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 650 km [*E] |
other data, primary: | diameterdp: | 4.49± 0.05 km [M11b] | | rotation periodRPp: | 2.75796h [JPL] | | amplitude in mag., rotationalΔM: | ? | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | ? | | diameter ratiods/dp: | ? | | component mag. differenceΔM: | ? | | rotation periodRPs: | ? | |
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--(6181) Bobweber --discovery and notes:
Primary discovered1986 Sep 06from Palomar Observatory, California, USAby E. F. Helin.Alternate designation(s):1986 RW, 1979 YU8, 1990 WL2.Linked to prediscovery observations from 1954 Mar 28.Permanent number assigned 1994 Dec 18.
Named 2008 Mar 21 for Robert Weber (1926-2008) [MPC62353].
Companion discoveredusinglightcurve observations.Announced2015 Dec.
--Links, more technical:
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--Links to ADS abstracts:
©2017by Wm. Robert Johnston.
Last modified16 July 2017.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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