Asteroids with Satellites Database--Johnston's Archive

(2500) Alascattalo

compiled by Wm. Robert Johnston
last updated 25 September 2021

--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: 2.2402954592 AU
orbital period P: 3.3531883447 yr
(= 1224.7751742 d)
eccentricity e: 0.098669163
perihelion distance q: 2.019247382 AU
aphelion distance Q: 2.4613435364 AU
inclination i: 6.9892326°
argument of perihelion ω: 160.78865°
ascending node Ω: 47.997935°
mean anomaly M: 12.477824°
perihelion passage TP: 2020 Apr 18.548529
Epoch: 2021 Jul 01
data arc: 1926-2020 (2249 obs.)
Earth MOID: 1.01474 AU
Jupiter Tisserand invariant TJ: 3.619

orbital data, secondary:
semimajor axis as: 57 km [*E]
separation/primary radius as/rp:16 [*E]
separation/Hill radius as/rH:0.051 [*E]
orbital period Ps: 7.046 ± 0.012 d [B20e]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 12.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 7.48 ± 0.13 km [M**]
geometric albedo: 0.257 ± 0.013 [M**]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 1100 km [*E]

other data, primary:
diameter dp: 6.97 ± 0.12 km [*D]
rotation period RPp: 2.75123 ± 0.00009 h [B20e]
amplitude in mag., rotational ΔM: 0.19 [B20e]
amplitude in mag., mutual events ΔM:0.21 ±0.06 [B20e]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 2.72 ± 0.15 km [*D]
diameter ratio ds/dp: 0.39 ± 0.02 [B20e]
component mag. difference ΔM: 2.04 ± 0.11 [*D]
rotation period RPs: ?

-- (2500) Alascattalo --discovery and notes:

Primary discovered 1926 Apr 02 from Heidelberg, Germany by K. Reinmuth. Alternate designation(s): 1926 GC, 1927 TA, 1946 FB, 1981 VD. Permanent number assigned 1981 Dec 11.

Named 1991 Nov 21 for the Alaskan mythical beast [MPC019332].

Companion discovered 2020 Mar 20 by Benishek, V., P. Pravec, F. Pilcher, A. Marchini, R. Papini, F. Salvaggio, J. Oey, D. Pray, R. Durkee, W. Cooney, J. Gross, D. Terrell, R. Goncalves, A. Aznar, C. Odden, and J. Kemp using lightcurve observations from Sopot Observatory, Serbia; Organ Mesa Observatory, New Mexico, USA; Astronomical Observaotry of the University of Siena; Blue Mountains Observatory, Leura, New South Wales, Australia; Sugarloaf Mountain Observatory, South Deerfield, Massachusetts, USA; Shed of Science South Observatory, Pontotoc, Texas, USA; Sonoita Resaerch Observatory, Sonoita, Arizona, USA; Linhaceira Observatory, Tomar, Portugal; Isaac Aznar Observatory, Alcublas, Valencia, Spain; Mittelman Observatories at New Mexico Skies. Announced 2020 Jun 07 [B20e].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020, 2021 by Wm. Robert Johnston.
Last modified 25 September 2021.
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