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Asteroids with Satellites Database--Johnston's Archive
(1934) Jeffers
compiled by Wm. Robert Johnston
last updated22 February 2025--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: | 2.39048333627 AU | | orbital periodP: | 3.6960410258 yr
(= 1349.97898468 d) | | eccentricitye: | 0.29948426121 | | perihelion distanceq: | 1.6745712004 AU | | aphelion distanceQ: | 3.1063954722 AU | | inclinationi: | 23.152796166° | | argument of perihelionω: | 294.85302089° | | ascending nodeΩ: | 86.466304142° | | mean anomalyM: | 41.83990581° | | perihelion passageTP: | 2024 May 13.1027956 | | Epoch: | 2024 Oct 17 | | data arc: | 1961-2023(7051 obs.) | | Earth MOID: | 0.794495 AU | | Jupiter Tisserand invariantTJ: | 3.366 |
orbital data, secondary: | semimajor axisas: | 27 km[*E] | | separation/primary radiusas/rp: | 6.1 [*E] | | separation/Hill radiusas/rH: | 0.021 [*E] | | orbital periodPs: | 1.4396± 0.0008d [P25a] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 12.65[MPC] | | slope parameterG: | 0.24 [P25a] | | effective diameterdE: | 9.24± 0.1 km [M14c] | | geometric albedo: | 0.245± 0.047[M14c] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | S (SMASSII) [X95a] | | massm: | ? | | densityρ: | (2 g/cm3) [*A] | | Hill radiusrH: | 1200 km [*E] |
other data, primary: | diameterdp: | 8.77± 0.09 km [*D] | | axial ratiosa/b, b/c: | 1.10662378397767, ? [*E] | | rotation periodRPp: | 6.045± 0.0006h [P25a] | | amplitude in mag., rotationalΔM: | 0.11 [P25a] | | amplitude in mag., mutual eventsΔM: | 0.11 [P25a] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | 2.90± 0.18km [*D] | | axial ratiosa/b, b/c: | 1.7;? [P25a] | | diameter ratiods/dp: | 0.33± 0.02 [P25a] | | component mag. differenceΔM: | 2.41± 0.13 [*D] | | rotation periodRPs: | 34.55± 0.02h [P25a] | |
|
--(1934) Jeffers --discovery and notes:
Primary discovered1972 Dec 02from Lick Observatory, Mount Hamilton, California, USAby A. R. Klemola.Alternate designation(s):1972 XB, 1951 AN1, 1961 YA, 2019 GT25.Linked to prediscovery observations from 1961 Dec 31.Permanent number assigned -.
Named 1976 Feb 20 for Hamilton M. Jeffers (1893-1976) [MPC003938].
Companion discovered2020 Dec 07 by P. Pravec, A. Marchini, et al.usinglightcurve observations from Astronomical Observatory of the University of Siena, Italy; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Skalnate Pleso Observatory, Slovakia; Shed of Science South Observatory, Pontotoc, Texas, USA; Blue Mountains Observatory, Leura, New South Wales, Australia.Announced2021 Jan 11 [P21h].
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--Links to ADS abstracts:
©2021-2022, 2025by Wm. Robert Johnston.
Last modified22 February 2025.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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