(363027) 1998 ST27

Asteroids with Satellites Database--Johnston's Archive

(363027) 1998 ST27

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 (PHA)
orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 0.819381537 AU
orbital period P: 0.741715685 yr
(= 270.9116540 d)
eccentricity e: 0.530011092
perihelion distance q: 0.385100234 AU
aphelion distance Q: 1.253662841 AU
inclination i: 21.055109°
argument of perihelion ω: 322.4540736°
ascending node Ω: 197.5705369°
mean anomaly M: 267.570433°
perihelion passage T_P: 2014 Jul 31.556241
Epoch: 2014 May 23
data arc: 1998-2012 (339 obs.)
Earth MOID: 0.0093758 AU
Jupiter Tisserand invariant T_J: 6.978

orbital data, secondary:

semimajor axis a_s: 4.5 ± 0.5 km [M03b]
separation/primary radius a_s/r_p: 17 [M03b]
separation/Hill radius a_s/r_H: 0.188 [*E]
orbital period P_s: 4.1 d [*E]
eccentricity e_s: >0.3 [B03b]
normalized ang. mom. α_L: ?

other data, system (combined):

absolute mag. H: 19.5 [MPC]
19.575 ± 0.49 [JPL]
slope parameter G: (0.15) [*A]
effective diameter d_E: 0.81 km [*D]
geometric albedo: 0.05 [B03b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm³) [*A]
Hill radius r_H: 24 km [*E]
other data, primary:

diameter d_p: 0.8 km [B03b]
rotation period RP_p: <3 h [B03b]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:

diameter d_s: 0.12 km [B03b]
diameter ratio d_s/d_p: 0.15 [*D]
component mag. difference ΔM: 4.1 [* D]
rotation period RP_s: <6 h [B03b]

-- (363027) 1998 ST27 --discovery and notes:

Primary discovered 1998 Sep 24 from Socorro, New Mexico, USA by LINEAR. Permanent number assigned 2013 Jun 23.

Companion discovered 2001 Oct 07 using radar observations. Announced 2001 Oct 09.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

Jacobson, Seth A., Scheeres, Daniel J., & McMahon, Jay 2014, The Astrophysical Journal Formation of the Wide Asynchronous Binary Asteroid Population
Fang, Julia & Margot, Jean-Luc 2012, The Astronomical Journal The Role of Kozai Cycles in Near-Earth Binary Asteroids
Brozović, Marina, Benner, Lance A. M., Taylor, Patrick A., Nolan, Michael C., Howell, Ellen S., Magri, Christopher, Scheeres, Daniel J., Giorgini, Jon D., Pollock, Joseph T., Pravec, Petr, Galád, Adrián, Fang, Julia, Margot, Jean-Luc, Busch, Michael W., Shepard, Michael K., Reichart, Daniel E., Ivarsen, Kevin M., Haislip, Joshua B., LaCluyze, Aaron P., Jao, Joseph, Slade, Martin A., Lawrence, Kenneth J., & Hicks, Michael D. 2011, Icarus Radar and optical observations and physical modeling of triple near-Earth Asteroid (136617) 1994 CC
Abell, P. A., Gaffey, M. J., Hardersen, P. S., Vilas, F., Jarvis, K. S., & Landis, R. R. 2005, Bulletin of the American Astronomical Society Compositions of Binary Near-Earth Objects: Implications for the Internal Structure of Their Parent Bodies
Benner, L. A. M. 2005, Society for Astronomical Sciences Annual Symposium Recent Arecibo and Goldstone Radar Imaging of Near-Earth Asteroids
Abell, P. A., Gaffey, M. J., & Hardersen, P. S. 2004, Bulletin of the American Astronomical Society Compositional Results of Binary Near-Earth Asteroid 2003 YT1: A Basaltic Achondrite
Benner, L. A. M., Nolan, M. C., Margot, J. L., Ostro, S. J., & Giorgini, J. D. 2003, Bulletin of the American Astronomical Society Radar Imaging of Binary Near-Earth Asteroid 1998 ST27
Abell, Paul A. 2003, Ph.D. Thesis Near-IR reflectance spectroscopy of mainbelt and near-Earth objects: A study of their compositions, meteorite affinities, and source regions
Abell, P. A., Gaffey, M. J., & Hardersen, P. S. 2002, Lunar and Planetary Science Conference A Detailed Compositional Investigation of the Potentially Hazardous Asteroid 1998 ST27
Benner, L. A. M., Nolan, M. C., Margot, J. L., Ostro, S. J., & Giorgini, J. D. 2003, AAS/Division for Planetary Sciences Meeting Radar Imaging of Binary Near-Earth Asteroid 1998 ST27
Abell, P. A., Gaffey, M. J., & Hardersen, P. S. 2002, Lunar and Planetary Institute Conference Abstracts A Detailed Compositional Investigation of the Potentially Hazardous Asteroid 1998 ST27
Benner, L. A. M., Nolan, M. C., Ostro, S. J., Giorgini, J. D., & Margot, J. L. 2001, International Astronomical Union Circular 1998 ST_27
Ticha, J., Tichy, M., Moravec, Z., Spratt, C. E., Balam, D. D., & Marsden, B. G. 2001, Minor Planet Electronic Circ., 2001-S28 (2001). 1998 ST27
Ticha, J., Tichy, M., Moravec, Z., Garradd, G. J., Zoltowski, F. B., Pravec, P., Sarounova, L., Kubat, J., Blythe, M., Shelly, F., Bezpalko, M., Stuart, J., Viggh, H., Sayer, R., & Williams, G. V. 1998, Minor Planet Electronic Circ., 1998-S34 (1998). 1998 ST27

© 2001-2013, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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