Borasisi
Number
66652
Provisional name
1999 RZ253
Class
Cubewano
Discovery
08.09.1999, 07:15:46 UT, Mauna Kea, Hawaii, USA
Discovery chart
Discovery position
25 Aquarius 32' Rx
Time of announcement
22.07.2000 - 02:42 UT
Naming
September 2007
Orbital period
290.3 years
Orbit
  • crosses the orbit of Pluto
Aphelion
48.045 AU
Perihelion
39.911 AU
Semimajor axis
43.978 AU
Magnitude
5.9
Diameter
126 - 390 km
Inclination
0.6
 
Borasisi has a binary companion.

Satellite
Pabu
Discovery
images 23.04.2003, 02:25:26 - 04:20:38 UT, Hubble Space Telescope
Time of announcement
Naming
September 2007
Distance between pair
4660 km +/- 170 km
Orbital period
46.263 +0.006/-0.074 d
 
The name comes from Kurt Vonnegut's novel Cat's Cradle.

"... wherein Borasisi, the sun, held Pabu, the moon, in his arms, and hoped that Pabu would bear him a fiery child.

"But poor Pabu gave birth to children that were cold, that did not burn; and Borasisi threw them away in disgust. These were the planets, who circled their terrible father at a safe distance.

"Then poor Pabu herself was cast away, and she went to live with her favorite child, which was Earth. Earth was Pabu's favorite because it had people on it; and the people looked up at her and loved her and sympathized."

The Books of Bokonon from Cat's Cradle

Bokononism, the fictional religion