(137170) 1999 HF1

Asteroids with Satellites Database--Johnston's Archive

(137170) 1999 HF1

compiled by Wm. Robert Johnston
last updated 20 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, Aten
orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 0.819109010 AU
orbital period P: 0.741345673 yr
(= 270.7765072 d)
eccentricity e: 0.462429639
perihelion distance q: 0.440328726 AU
aphelion distance Q: 1.197889295 AU
inclination i: 25.6619416°
argument of perihelion ω: 253.373619°
ascending node Ω: 155.894894°
mean anomaly M: 237.242376°
perihelion passage T_P: 2014 Aug 23.33300
Epoch: 2014 May 23
data arc: 1999-2014 (2680 obs.)
Earth MOID: 0.173405 AU
Jupiter Tisserand invariant T_J: 6.987

orbital data, secondary:

binary dynamical type: A [P07f]
semimajor axis a_s: 7.3 ± 1.8 km [*D]
separation/primary radius a_s/r_p: 4.0 [P02a]
separation/Hill radius a_s/r_H: 0.054 [*D]
orbital period P_s: 0.58404 ± 0.00017 d [P02a]
eccentricity e_s: ?
normalized ang. mom. α_L: 1.14 [P07f]

other data, system (combined):

absolute mag. H: 14.5 [MPC]
14.41 [JPL]
slope parameter G: (0.15) [*A]
effective diameter d_E: 3.73 ± 1/0.5 km [W05e]
geometric albedo: 0.18 ± 0.07 [W05e]
color index U-B: ?
color index B-V: 0.719 [P02a]
color index V-R: 0.4 ± 0.01 [P02a]
color index B-R: 1.12 [P02a]
color index V-I: 0.76 [P02a]
taxonomic type: X (SMASSII) [JPL]
mass m: 5.09x10¹³ kg [*D]
density ρ: >2 g/cm³[P02a]
Hill radius r_H: 130 km [*D]
other data, primary:

diameter d_p: 3.64 ± 0.73 km [*D]
rotation period RP_p: 2.319 ± 0.000 h [P02a]
amplitude in mag., rotational ΔM: 0.26 [W14e]
pole direction Β, λ: ? , ?

other data, secondary:

diameter d_s: 0.84 ± 0.2 km [*D]
diameter ratio d_s/d_p: 0.23 ± 0.03 [P06b]
component mag. difference ΔM: 3.2 ± 0.3 [*D]
rotation period RP_s: ?

-- (137170) 1999 HF1 --discovery and notes:

Primary discovered 1999 Apr 20 from Anderson Mesa Station, Arizona, USA by LONEOS. Permanent number assigned 2006 Dec 05.

Companion discovered 1999 Apr 23 using lightcurve observations. Announced 1999.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

Vereshchagina, I., Sokov, E., Gorshanov, D., Devyatkin, A., Romas, E., L'vov, V., Slesarenko, V., Rastegaev, D., Balega, Yu., Maximov, A., Diachenko, V., Malogolovec, E., Kouprianov, V., & Naiden, Ya. 2012, European Planetary Science Congress 2012 Investigation of binary asteroids and NEOs
Elenin, Leonid & Molotov, Igor 2012, Minor Planet Bulletin Asteroids Lightcurve Analysis at the Ison-NM Observatory: 3122 Florence, (25916) 2001 CP44, (47035) 1998 WS, (137170) 1999 HF1
Vereshagina, I. A., Devyatkin, A. V., Gorshanov, D. L., & Sokov, Ye. N. 2012, Fifty years of Cosmic Era: Real and Virtual Studies of the Sky. Conference of Young Scientists of CIS Countries Photometric research of binary and triple asteroids with the use automatic telescopes of Pulkovo Observatory
Vereshchagina, I. A. 2011, ArXiv e-prints Investigation of multiple asteroids 2006 VV2, (45) Eugenia, (90) Antiope, (762) Pulcova, (87) Sylvia, 137170 (1999 HF1)
Pravec, Petr & Scheirich, P. 2010, Bulletin of the American Astronomical Society Binary System Candidates for Detection of BYORP
Polishook, D. & Brosch, N. 2008, Icarus Photometry of Aten asteroids—More than a handful of binaries
Kumar, S., Hardersen, P. S., & Gaffey, M. J. 2006, 37th Annual Lunar and Planetary Science Conference Albedo Estimates and Near-Infrared Reflectance Spectroscopy of Near Earth Asteroids 1999 HF1 and 2005 AB
Wolters, Stephen D., Green, Simon F., McBride, Neil, & Davies, John K. 2005, Icarus Optical and thermal infrared observations of six near-Earth asteroids in 2002
Pravec, P., Sarounova, L., Hicks, M. D., Rabinowitz, D. L., Wolf, M., Scheirich, P., & Krugly, Y. N. 2002, Minor Planet Bulletin Doubly-periodic Lightcurve of 1999 HF1 - A Binary NEA Candidate
Pravec, Petr, Šarounová, Lenka, Hicks, Michael D., Rabinowitz, David L., Wolf, Marek, Scheirich, Peter, & Krugly, Yurij N. 2002, Icarus Two Periods of 1999 HF₁-Another Binary NEA Candidate
Williams, G. V. 2000, Minor Planet Electronic Circ., 2000-A12 (2000). 1999 HF1
Kidger, Marc 1999, Research Amateur Astronomy in the VLT Era Pro-Am Collaboration in Asteroid Observations
Koehn, B. W. & Bowell, E. 1999, AAS/Division for Planetary Sciences Meeting Enhancing the Lowell Observatory Near-Earth-Object Search
Tichy, M., Moravec, Z., Griesser, M., Sarounova, L., Balam, D. D., Hermann, S. M., Koehn, B. W., Ries, J. G., Africano, J., Griffin, I. P., & Marsden, B. G. 1999, Minor Planet Electronic Circ., 1999-H17 (1999). 1999 HF1

© 2001-2006, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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