(15788) 1993 SB

Infobox Planet
bgcolour=#FFFFC0
name=(15788) 1993 SB
discovery=yes
discoverer=Iwan P. Williams, Alan Fitzsimmons, and Donal O'Ceallaigh
discovered=September 16, 1993
mp_name=
alt_names="none"
mp_category=Plutino
epoch=March 6, 2006 (JD 2453800.5)
semimajor=5,856.2 Gm (39.146 AU)
perihelion=3,997.1 Gm (26.719 AU)
aphelion=7,715.1 Gm (51.572 AU)
eccentricity=0.317
period=89,461 d (244.93 a)
inclination=1.9°
asc_node=354.9°
arg_peri=79.5°
mean_anomaly=335.2°
avg_speed=4.64 km/s
physical_characteristics=yes
dimensions=130? km
mass=~2×10¹⁸ kg
density=2.0? g/cm³
surface_grav=~0.04 m/s²
escape_velocity=~0.07 km/s
sidereal_day=? d
spectral_type=?
abs_magnitude=7.7
albedo=0.09?
single_temperature=~44 K

(15788) 1993 SB is a trans-Neptunian object of the plutino class. Apart from Pluto, it was one of the first such objects discovered (beaten by two days by 1993 RO and by one day by 1993 RP), and the first to have an orbit calculated well enough to receive a number. The discovery was made in 1993 at the La Palma Observatory with the Isaac Newton Telescope. Very little is known about the object. Even the diameter estimate of ~130 km is based on the guess of an albedo of 0.09 [http://www.johnstonsarchive.net/astro/tnoslist.html] .

External links

* [http://cfa-www.harvard.edu/mpec/J93/J93S09.html First MPEC listing]
* [http://cfa-www.harvard.edu/mpec/J94/J94S06.html MPEC: recovery of the object]
* [http://www.johnstonsarchive.net/astro/tnoslist.html list of known TNOs, including size estimates]
* [http://cfa-www.harvard.edu/iau/lists/MPLists.html IAU minor planet lists]
* [http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1993SB;orb=1;view=Far Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=1993SB Ephemeris]