52975 Cyllarus

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52975 Cyllarus
Cyllarus as seen by the Keck telescope at an apparent magnitude of 23
Discovery [1]
Discovered by N. Danzl
Discovery site Kitt Peak National Obs.
Discovery date 12 October 1998
MPC designation (52975) Cyllarus
Pronunciation /ˈsɪlərəs/
Named after
Cyllarus (Greek mythology)[2]
1998 TF35
distant[3] · centaur[1][4]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 4
Observation arc 9.95 yr (3,636 days)
Aphelion 35.998 AU
Perihelion 16.281 AU
26.139 AU
Eccentricity 0.3772
133.64 yr (48,814 days)
0° 0m 26.64s / day
Inclination 12.650°
Jupiter MOID 11.41 AU
Jupiter Tisserand parameter 4.250
Physical characteristics
Dimensions 70 km (generic at 0.07)[5]

52975 Cyllarus (/ˈsɪlərəs/), provisionally designated 1998 TF35, is a centaur orbiting in the outer Solar System. It was discovered on 12 October 1998, by American astronomer Nichole Danzl at the Kitt Peak National Observatory near Sells, Arizona, in the United States.[3] It was later named after the mythological creature Cyllarus.[2]

Orbit and classification[edit]

Cyllarus orbits the Sun at a distance of 16.3–36.0 AU once every 133 years and 8 months (48,814 days). Its orbit has an eccentricity of 0.38 and an inclination of 13° with respect to the ecliptic.[1] Cyllarus came to perihelion in September 1989. The body's observation arc begins with its official discovery observation at Kitt Peak, as no precoveries were taken, and no prior identifications were made.[3]

Physical characteristics[edit]

In November 2009, Mike Brown and his team using the Keck telescope took a spectrum of Cyllarus (apparent magnitude 23), giving it "the record for the faintest spectrum of a Kuiper belt object".[citation needed]

As of 2017, no rotational lightcurve has been obtained from photometric observations. The bodys rotation period and shape, as well as its spectral type remains unknown.[1][7]

Based on an generic magnitude-to-diameter conversion, Cyllarus measures roughly about 70 kilometers in diameter, assuming a typical albedo of 0.07 for a centaur.[5] It has an absolute magnitude of 9.4.[1]


This minor planet was named for the Cyllarus, a centaur of Greek mythology.[2] The official naming citation was published on 14 June 2003 (M.P.C. 49102).[8]


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 52975 Cyllarus (1998 TF35)" (2008-09-25 last obs.). Jet Propulsion Laboratory. Retrieved 25 April 2017. 
  2. ^ a b c Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (52975) Cyllarus, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 217. ISBN 978-3-540-34361-5. Retrieved 25 April 2017. 
  3. ^ a b c "52975 Cyllarus (1998 TF35)". Minor Planet Center. Retrieved 25 April 2017. 
  4. ^ Marc W. Buie. "Orbit Fit and Astrometric record for 52975" (2008-09-25 using 29 observations). SwRI (Space Science Department). Retrieved 2009-11-22. 
  5. ^ a b "Absolute Magnitude (H)". NASA/JPL. Retrieved 25 April 2017. 
  6. ^ "AstDys (52975) Cyllarus Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 25 April 2017. 
  7. ^ "LCDB Data for (52975) Cyllarus". Asteroid Lightcurve Database (LCDB). Retrieved 25 April 2017. 
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 April 2017. 

External links[edit]