52975 Cyllarus

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52975 Cyllarus
Cyllarus as seen by the Keck telescope at an apparent magnitude of 23
Discovery [1]
Discovered byN. Danzl
Discovery siteKitt Peak National Obs.
Discovery date12 October 1998
MPC designation(52975) Cyllarus
Named after
Cyllarus (Greek mythology)[2]
1998 TF35
distant[3] · centaur[1][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc9.95 yr (3,636 days)
Aphelion35.971 AU
Perihelion16.254 AU
26.113 AU
133.44 yr (48,739 days)
0° 0m 26.64s / day
Physical characteristics
Dimensions70 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 in the outer main-belt at a distance of 16.3–36.0 AU once every 133 years and 5 months (48,739 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 body's rotation period and shape, as well as its spectral type remains unknown.[1][7]

Based on a 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 approved 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 28 June 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]