(31345) 1998 PG

Asteroids with Satellites Database--Johnston's Archive

(31345) 1998 PG

compiled by Wm. Robert Johnston
last updated 21 September 2014

--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: NEA, Amor
orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.014955130 AU
orbital period P: 2.860264998 yr
(= 1044.7117910 d)
eccentricity e: 0.391553520
perihelion distance q: 1.225992357 AU
aphelion distance Q: 2.803917903 AU
inclination i: 6.4942996°
argument of perihelion ω: 155.955286°
ascending node Ω: 222.793932°
mean anomaly M: 162.183243°
perihelion passage T_P: 2013 Feb 06.34792
Epoch: 2014 May 23
data arc: 1978-2014 (684 obs.)
Earth MOID: 0.232775 AU
Jupiter Tisserand invariant T_J: 3.72

orbital data, secondary:

binary dynamical type: A [M09a]
semimajor axis a_s: 1.4 km [*E]
separation/primary radius a_s/r_p: 3.1 [*E]
separation/Hill radius a_s/r_H: 0.016 [*E]
orbital period P_s: 0.5835 ± 0.00004 d [P06b]
eccentricity e_s: ?
normalized ang. mom. α_L: 1.2 [M09a]

other data, system (combined):

absolute mag. H: 17.3 [MPC]
17.64 ± 0.14 [P00a]
slope parameter G: (0.15) [*A]
effective diameter d_E: 0.94 ± 0.21 km [*D]
geometric albedo: 0.18 [P06b]
color index U-B: ?
color index B-V: 0.81 [P00a]
color index V-R: 0.44 ± 0.01 [P00a]
color index B-R: 1.25 [P00a]
color index V-I: 0.76 [P00a]
taxonomic type: Sq (SMASSII) [JPL]
mass m: ?
density ρ: (1.6 g/cm³) [*A]
Hill radius r_H: 87 km [*E]
other data, primary:

diameter d_p: 0.9 ± 0.2 km [P06b]
rotation period RP_p: 2.51620 ± 0.00003 h [P00a]
amplitude in mag., rotational ΔM: 0.11 [W14e]
pole direction Β, λ: ? , ?

other data, secondary:

diameter d_s: 0.27 km [*D]
diameter ratio d_s/d_p: 0.3 [P06b]
component mag. difference ΔM: 2.6 [*D]
rotation period RP_s: ?

-- (31345) 1998 PG --discovery and notes:

Primary discovered 1998 Aug 03 from Anderson Mesa Station, Arizona, USA by LONEOS. Linked to prediscovery observations from 1978 Oct 07. Permanent number assigned 2001 Nov 30.

Companion discovered 1998 Aug 29 using lightcurve observations. Announced 1998.

--Links, more technical:

CBET 1881.

--Links, less technical:

--Links to ADS abstracts:

Pravec, Petr, Šarounová, Lenka, Rabinowitz, David L., Hicks, Michael D., Wolf, Marek, Krugly, Yurij N., Velichko, Fiodor P., Shevchenko, Vasilij G., Chiorny, Vasilij G., Gaftonyuk, Ninel M., & Genevier, Guy 2000, Icarus Two-Period Lightcurves of 1996 FG <SUB>3</SUB>, 1998 PG, and (5407) 1992 AX: One Probable and Two Possible Binary Asteroids
Kiss, L. L., Szabó, Gy., & Sárneczky, K. 1999, Astronomy and Astrophysics Supplement Series CCD photometry and new models of 5 minor planets
Helin, E. F., Lawrence, K. J., & Williams, G. V. 1999, Minor Planet Electronic Circ., 1999-J38 (1999). 1998 PG
Tichy, M., Moravec, Z., Nakamura, A., Wolf, M., Sarounova, L., Stoss, R., Delp, S., Busch, M., Balam, D. D., Onken, C. A., Casarramona, F., Vigil, E., Oscoz, A., Osorio, M. R., & Williams, G. V. 1998, Minor Planet Electronic Circ., 1998-P13 (1998). 1998 PG

© 2001-2005, 2014 by Wm. Robert Johnston.
Last modified 21 September 2014.
Return to Home. Return to Astronomy and Space. Return to Asteroids with Satellites.