Asteroids with Satellites Database--Johnston's Archive

(25021) Nischaykumar

compiled by Wm. Robert Johnston
last updated 1 June 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: 2.318479503 AU
orbital period P: 3.530245362 yr
(= 1289.4464713 d)
eccentricity e: 0.101093335
perihelion distance q: 2.084096678 AU
aphelion distance Q: 2.552862328 AU
inclination i: 3.7845315°
argument of perihelion ω: 108.287739°
ascending node Ω: 188.580808°
mean anomaly M: 335.88462°
perihelion passage TP: 2019 Jul 22.37636
Epoch: 2019 Apr 27
data arc: 1977-2018 (685 obs.)
Earth MOID: 1.0714 AU
Jupiter Tisserand invariant TJ: 3.57


orbital data, secondary:
semimajor axis as: ?
separation/primary radius as/rp:4.8 [P19a]
orbital period Ps: 0.97898 ± 0.00002 d [P19a]
eccentricity es: 0 [P19a]
normalized ang. mom. αL: 1.09 [P19a]

other data, system (combined):
absolute mag. H: 15.7 [MPC]
15.94 ± 0.03 [P19a]
slope parameter G: (0.15) [*A]
effective diameter dE: 2.1 ± 0.6 km [P19a]
geometric albedo: 0.16 ± 0.08 [P19a]
color index U-B: ?
color index B-V: ?
color index V-R:0.507 ± 0.013 [P19a]
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 330 km [*E]

other data, primary:
diameter dp: 2 ± 0.6 km [P19a]
axial ratios a/b, b/c:1.05, ? [P19a]
rotation period RPp: 2.5344 ± 0.0012 h [P19a]
amplitude in mag., rotational ΔM: 0.07 ± 0.04 [P19a]
pole direction Β, λ: 284 ± 21° , -86 ± 21° [P19a]


other data, secondary:
diameter ds: 0.56 km [*D]
axial ratios a/b, b/c:1.46;? [P19a]
diameter ratio ds/dp: 0.28 ± 0.03 [P19a]
component mag. difference ΔM: <2.8 [*D]
rotation period RPs: 23.5 h [P19a]

-- (25021) Nischaykumar --discovery and notes:

Primary discovered 1998 Aug 17 from Socorro, New Mexico, USA by LINEAR Program. Alternate designation(s): 1998 QV17, 1977 RH14, 1997 GO26. Linked to prediscovery observations from 1977 Aug 09. Permanent number assigned 2001 Jun 06.

Named 2008 Sep 17 for Nischay Kumar (1990-) [MPC063875].

Companion discovered 0 by Pravec, P., et al. using lightcurve observations. Announced 2019 May [P19a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2019 by Wm. Robert Johnston.
Last modified 1 June 2019.
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