(285263) 1998 QE2

Asteroids with Satellites Database--Johnston's Archive

(285263) 1998 QE2

compiled by Wm. Robert Johnston
last updated 16 November 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 (PHA)
orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.423106551 AU
orbital period P: 3.77188781773725 yr
(= 1377.708045 d)
eccentricity e: 0.571515197
perihelion distance q: 1.038264332 AU
aphelion distance Q: 3.807948769 AU
inclination i: 12.8552998°
argument of perihelion ω: 345.6556294°
ascending node Ω: 250.1503259°
mean anomaly M: 148.3901474°
perihelion passage T_P: 2013 May 20.1158337
Epoch: 2014 Dec 09
data arc: 1998-2014 (1771 obs.)
Earth MOID: 0.0358143 AU
Jupiter Tisserand invariant T_J: 3.239

orbital data, secondary:

semimajor axis a_s: 6.212 ± 0.1 km [S14a]
separation/primary radius a_s/r_p: 3.9 [*D]
separation/Hill radius a_s/r_H: 0.030 [*E]
orbital period P_s: 1.3046 ± 0.0004 d [S14b]
eccentricity e_s: <0.01 [S14a]
normalized ang. mom. α_L: ?

other data, system (combined):

absolute mag. H: 17.3 [MPC]
17.07 ± 0.67 [JPL]
slope parameter G: (0.15) [*A]
effective diameter d_E: 3.09 km [*D]
geometric albedo: 0.05 ± 0.03 [S14a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: 0.82 g/cm³[S14a]
Hill radius r_H: 210 km [*E]
other data, primary:

diameter d_p: 3.2 ± 0.3 km [S14b]
rotation period RP_p: 4.751 ± 0.001 h [H14b]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:

diameter d_s: 0.8 ± 0.08 km [S14b]
diameter ratio d_s/d_p: 0.25 ± 0.03 [*D]
component mag. difference ΔM: 3.0 [*D]
rotation period RP_s: 1.3046 ± 0.0004 h [S14b]

-- (285263) 1998 QE2 --discovery and notes:

Primary discovered 1998 Aug 19 from Socorro, New Mexico, USA by LINEAR. Permanent number assigned 2011 Sep 12.

Companion discovered 2013 May 29 using radar observations. Announced 2013 May 30.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

Springmann, A., Taylor, P. A., Howell, E. S., Nolan, M. C., Benner, L. A. M., Brozović, M., Giorgini, J. D., & Margot, J. L. 2014, Lunar and Planetary Science Conference Radar Shape Model of Binary Near-Earth Asteroid (285263) 1998 QE2
Vodniza, A. Q. & Pereira, M. R. 2014, Lunar and Planetary Science Conference Study of the Asteroid 1998 QE2
Hills, Kevin 2014, Minor Planet Bulletin Asteroid Lightcurve Analysis at Riverland Dingo Observatory (RDO): 2013 Results
Vodniza, Alberto Q., Pereira, M. R., Arecibo Observatory Team, & JPL Target Asteroids Team 2013, AAS/Division for Planetary Sciences Meeting Abstracts The Asteroid 1998 QE2
Butler, Bryan J., Gurwell, M. A., & Moullet, A. 2013, AAS/Division for Planetary Sciences Meeting Abstracts Observations of NEA 1998 QE2 with the SMA and VLA
Springmann, Alessondra, Brozović, M., Pravec, P., Taylor, P. A., Howell, E. S., Nolan, M. C., Benner, L. M., Busch, M. W., Giorgini, J. D., Magri, C., Margot, J., Naidu, S. P., Shepard, M. K., Marshall, S. E., Law, M. C., Galád, A., Világi, J., Gary, B. L., Hicks, M. D., Hills, K., Pray, D. P., & Vodniza, A. Q. 2013, AAS/Division for Planetary Sciences Meeting Abstracts Binary Near-Earth Asteroid (285263) 1998 QE2: Goldstone and Arecibo Radar Imaging and Lightcurve Observations
Hicks, M., Lawrence, K., Chesley, S., Chesley, J., Rhoades, H., Elberhar, S., Carcione, A., & Borlase, R. 2013, The Astronomer's Telegram Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2).
Hicks, M., Buratt, B., & Dalba, P. 2013, The Astronomer's Telegram BVRI photometry of the Potentially Hazardous Asteroid 285263 (1998 QE2).

© 2013, 2014 by Wm. Robert Johnston.
Last modified 16 November 2014.
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