Asteroids with Satellites Database--Johnston's Archive

(19281) 1996 AP3

compiled by Wm. Robert Johnston
last updated 20 November 2022

--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: 2.2873994221 AU
orbital period P: 3.459562754 yr
(= 1263.605296 d)
eccentricity e: 0.193640059
perihelion distance q: 1.844467264 AU
aphelion distance Q: 2.7303315801 AU
inclination i: 6.82469998°
argument of perihelion ω: 66.4001635°
ascending node Ω: 273.3179446°
mean anomaly M: 343.1039513°
perihelion passage TP: 2022 Oct 07.305380
Epoch: 2022 Aug 09
data arc: 1988-2022 (2729 obs.)
Earth MOID: 0.847559 AU
Jupiter Tisserand invariant TJ: 3.567

orbital data, secondary:
semimajor axis as: 9.2 km [*E]
separation/primary radius as/rp:4.2 [*E]
separation/Hill radius as/rH:0.015 [*E]
orbital period Ps: 0.9279 ± 0.0004 d [B22n]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 13.81 [MPC]
slope parameter G: (0.24) [*A]
effective diameter dE: 4.51 ± 0.24 km [M**]
geometric albedo: 0.316 ± 0.097 [M**]
color index U-B: ?
color index B-V: ?
color index J-H:-0.042 ± 0.178 [LMP]
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 630 km [*E]

other data, primary:
diameter dp: 4.36 ± 0.23 km [*D]
rotation period RPp: 2.37256 ± 0.0001 h [B22n]
amplitude in mag., rotational ΔM: 0.17 [B22m]
amplitude in mag., mutual events ΔM:0.17 [B22n]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: >1.13 ± 0.06 km [*D]
axial ratios a/b, b/c:1.3;? [B22n]
diameter ratio ds/dp: >0.26 [B22n]
component mag. difference ΔM: <2.9 [*D]
rotation period RPs: 22.27 ± 0.01 h [B22n]

-- (19281) 1996 AP3 --discovery and notes:

Primary discovered 1996 Jan 14 from Haleakala, Hawaii, USA by AMOS. Alternate designation(s): 1988 XD4. Linked to prediscovery observations from 1988 Dec 01. Permanent number assigned 2000 Dec 11.

Companion discovered 2022 Jun 30 by V. Benishek, P. Pravec, P. Fatka, K. Hornoch, P. Kusnirak, P. Bacci, M. Masestripieri, A. Marchini, R. Papini, and D. Pray using lightcurve observations from Sopot Observatory, Serbia; Ondrejov Observatory, Czech Republic; San Marcello Pistoiese Observatory, Italy; Astronomical Observatory of the University of Siena; Sugarloaf Mountain Observatory, South Deerfield, Massachusets, USA. Announced 2022 Nov 20 [B22n].

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© 2022 by Wm. Robert Johnston.
Last modified 20 November 2022.
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