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Asteroids with Satellites Database--Johnston's Archive
(31346) 1998 PB1
compiled by Wm. Robert Johnston
last updated9 October 2021--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: | 2.0294639991 AU | | orbital periodP: | 2.8911593403 yr
(= 1056.0158932 d) | | eccentricitye: | 0.429985049 | | perihelion distanceq: | 1.15682482 AU | | aphelion distanceQ: | 2.9021031761 AU | | inclinationi: | 5.9637866° | | argument of perihelionω: | 350.5342° | | ascending nodeΩ: | 299.732528° | | mean anomalyM: | 337.893737° | | perihelion passageTP: | 2021 Sep 03.846013 | | Epoch: | 2021 Jul 01 | | data arc: | 1998-2021(615 obs.) | | Earth MOID: | 0.141241 AU | | Jupiter Tisserand invariantTJ: | 3.685 |
orbital data, secondary: | semimajor axisas: | 3.6 km[*E] | | separation/primary radiusas/rp: | 7.9 [*E] | | separation/Hill radiusas/rH: | 0.043 [*E] | | orbital periodPs: | 2.308± 0.004d [P21d] | | eccentricityes: | ? | | normalized ang. mom.αL: | ? |
| other data, system (combined):| absolute mag.H: | 17.09[MPC]
17.29 ± 0.08 [P21d] | | slope parameterG: | (0.15) [*A] | | effective diameterdE: | 0.981± 0.453/0.217 km [N18a] | | geometric albedo: | 0.201± 0.138/0.109[N18a] | | color indexU-B: | ? | | color indexB-V: | ? | | color indexV-R: | 0.43 ± 0.02 [P21d] | | taxonomic type: | ? | | massm: | ? | | densityρ: | (1.6 g/cm3) [*A] | | Hill radiusrH: | 80 km [*E] |
other data, primary: | diameterdp: | 0.92± 0.78/0.38 km [*D] | | rotation periodRPp: | 2.7358± 0.0002h [P21d] | | amplitude in mag., rotationalΔM: | 0.13 [P21d] | | amplitude in mag., mutual eventsΔM: | 0.15 [P21d] | | pole directionΒ, λ: | ?,? |
other data, secondary: | diameterds: | >0.35± 0.11km [*D] | | diameter ratiods/dp: | >0.38 [P21d] | | component mag. differenceΔM: | <2.10 [*D] | | rotation periodRPs: | ? | |
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--(31346) 1998 PB1 --discovery and notes:
Primary discovered1998 Aug 15from Socorro, New Mexico, USAby Lincoln Laboratory Near-Earth Asteroid Research Team.Linked to prediscovery observations from 1998 Jul 14.Permanent number assigned 2001 Nov 30.
Companion discovered2021 Apr 06 by P. Pravec, P. Kusnirak, K. Hornoch, P. Fatka, H. Kucakova, and C. Snodgrassusinglightcurve observations.Announced2021 Jun 16 [P21d].
--Links, more technical:
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--Links to ADS abstracts:
©2021, 2021by Wm. Robert Johnston.
Last modified9 October 2021.Return toHome. Return toAstronomy and Space. Return toAsteroids with Satellites.
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