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Asteroids with Satellites Database--Johnston's Archive
(38079) 1999 HF
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: | 2.3239710619 AU | | orbital periodP: | 3.5427954143 yr
(= 1294.0304644 d) | | eccentricitye: | 0.191858478 | | perihelion distanceq: | 1.87809751 AU | | aphelion distanceQ: | 2.769844614 AU | | inclinationi: | 24.1393873° | | argument of perihelionω: | 2.868655° | | ascending nodeΩ: | 182.2930465° | | mean anomalyM: | 16.4959645° | | perihelion passageTP: | 2020 Apr 01.704776 | | Epoch: | 2020 May 31 | | data arc: | 1993-2020(1663 obs.) | | Earth MOID: | 0.880853 AU | | Jupiter Tisserand invariantTJ: | 3.436 |
orbital data, secondary: | semimajor axisas: | 5.9 km[*E] | | separation/primary radiusas/rp: | 3.5 [*E] | | separation/Hill radiusas/rH: | 0.012 [*E] | | orbital periodPs: | 0.6948± 0.0004d [B20f] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 14.3[MPC] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 3.42± 0.12 km [M11b] | | geometric albedo: | 0.287± 0.070[M11b] | | color indexU-B: | ? | | color indexB-V: | ? | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 500 km [*E] |
other data, primary: | diameterdp: | 3.42± 0.12 km [M11b] | | rotation periodRPp: | 16.675h [W20b] | | amplitude in mag., rotationalΔM: | 0.42 [W20b] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | ? | | diameter ratiods/dp: | ? | | component mag. differenceΔM: | ? | | rotation periodRPs: | ? | |
|
--(38079) 1999 HF --discovery and notes:
Primary discovered1999 Aor 16from Xinglong, PR Chinaby BAO Schmidt CCD Asteroid Program.Alternate designation(s): 1993 SY7.Linked to prediscovery observations from 1993 Sep 17.Permanent number assigned 2002 Mar 28.
Companion discovered2020usinglightcurve observations.Announced2020 Jun 11.
--Links, more technical:
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--Links to ADS abstracts:
©2020-2021, 2022by Wm. Robert Johnston.
Last modified30 April 2022.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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