Asteroids with Satellites Database--Johnston's Archive

(25015) 1998 QN2

compiled by Wm. Robert Johnston
last updated 27 May 2019

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this 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 axis a: 2.2283513608 AU
orbital period P: 3.3264079163 yr
(= 1214.993438 d)
eccentricity e: 0.197874383
perihelion distance q: 1.787417711 AU
aphelion distance Q: 2.66928501 AU
inclination i: 5.755463°
argument of perihelion ω: 41.351514°
ascending node Ω: 265.727845°
mean anomaly M: 333.322025°
perihelion passage TP: 2018 Jun 21.037680
Epoch: 2018 Mar 23
data arc: 1968-2018 (1264 obs.)
Earth MOID: 0.776653 AU
Jupiter Tisserand invariant TJ: 3.612


orbital data, secondary:
semimajor axis as: 8.9 km [*E]
separation/primary radius as/rp:6.7 [*E]
separation/Hill radius as/rH:0.019 [*E]
orbital period Ps: 1.833 ± 0.0012 d [W19c]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.7 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 2.899 ± 0.353 km [M19a]
geometric albedo: 0.365 ± 0.134 [**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 470 km [*E]

other data, primary:
diameter dp: 2.64 ± 0.35 km [*D]
rotation period RPp: 4.4011 ± 0.0003 h [B18o]
amplitude in mag., rotational ΔM: 0.27 [B18o]
amplitude in mag., mutual events ΔM:0.2 ±0.06 [B18o]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 1.19 ± 0.18 km [*D]
diameter ratio ds/dp: 0.45 ± 0.04 [W19c]
component mag. difference ΔM: 1.73 ± 0.19 [*D]
rotation period RPs: ?

-- (25015) 1998 QN2 --discovery and notes:

Primary discovered 1998 Aug 19 from Haleakala, Hawaii, USA by JPL/GEODSS NEAT. Alternate designation(s): 1968 OJ1, 1988 PY3. Linked to prediscovery observations from 1968 Jul 25. Permanent number assigned 2001 Jun 06.

Companion discovered 2018 Aug 13 by V. Benishek, P. Pravec, J. Oey, R. Groom, D. Pray, and V. Chiorny using lightcurve observations from Sopot Observatory, Serbia; Blue Mountains Observatory; Darling range Observatory; Sugarloaf Mountain Observatory; Chuguev Station, Kharkiv Observatory, Ukraine. Announced 2018 Sep 14 [B18o].

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© 2018, 2019 by Wm. Robert Johnston.
Last modified 27 May 2019.
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