2433 Sootiyo

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2433 Sootiyo
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date5 April 1981
MPC designation(2433) Sootiyo
Named after
"star boy" (Hopi language)[2]
1981 GJ · 1939 KA
1960 KA · 1969 QF
1974 VZ1 · 1978 SG6
1978 UL
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.40 yr (23,157 days)
Aphelion3.1849 AU
Perihelion2.0276 AU
2.6062 AU
4.21 yr (1,537 days)
0° 14m 3.48s / day
Physical characteristics
Dimensions12.076±0.136 km[1][4]
12.946±0.103 km[5]
14.85±0.37 km[6]
14.89 km (calculated)[3]
7 h[7][a]
7.2298±0.0002 h[8]
0.20 (assumed)[3]
LS [9] · S[3]
11.5[1][3][5] · 11.80[6] · 11.86±0.62[9]

2433 Sootiyo, provisional designation 1981 GJ, is a stony asteroid from the middle region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 5 April 1981, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona.[10] The asteroid was named "Sootiya" meaning "star boy" in the Hopi language.[2]

Orbit and classification[edit]

Sootiyo orbits the Sun in the central main-belt at a distance of 2.0–3.2 AU once every 4 years and 3 months (1,537 days). Its orbit has an eccentricity of 0.22 and an inclination of 10° with respect to the ecliptic.[1] The first used precovery was taken at Palomar Observatory in 1953, extending the asteroid's observation arc by 28 years prior to its discovery observation.[10]

Physical characteristics[edit]

PanSTARRS photometric survey characterized Sootiyo as a LS-type, an intermediary between the stony S-type and rare L-type asteroids.[9]

Rotation period[edit]

French amateur astronomer René Roy obtained a rotational lightcurve from photometric observations in October 2007. It gave a rotation period of 7.2298 hours with a brightness variation of 0.54 magnitude (U=2+), superseding observations by Brazilian Cláudia Angeli and by the Spanish ECLA project, which both gave a period of 7 hours with an amplitude of 0.57 and 0.4 magnitude, respectively (U=1/2).[7][a]

Diameter and albedo[edit]

According to the survey carried out by the Japanese Akari satellite, the asteroid measures 14.9 kilometers in diameter and its surface has an albedo of 0.156,[6] while two different data sets from NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission give a diameter of 12.1 and 12.9 kilometers with an albedo of 0.269 and 0.304, respectively.[4][5]

The Collaborative Asteroid Lightcurve Link agrees with the results obtained by Akari, assuming a standard albedo for stony asteroids of 0.20 and calculating a diameter of 14.9 kilometers with an absolute magnitude of 11.5.[3]


This minor planet is named "Sootiya" which means "star boy" in the language of the Hopi Tribe of northern Arizona. Correspondingly, the Vestian asteroid 2432 Soomana stands for "star girl".[2] Naming citation was proposed by Michael Lomatewama and Ekkehart Malotki and published on 8 February 1982 (M.P.C. 6650).[11]


  1. ^ a b ECLA (2011) web: rotation period hours with a brightness amplitude of mag. Summary figures for (2433) Sootiyo at Collaborative Asteroid Lightcurve Link (CALL) and Proyecto ECLA (Silvia Alonso Perez) (2011)


  1. ^ a b c d e f "JPL Small-Body Database Browser: 2433 Sootiyo (1981 GJ)" (2017-03-05 last obs.). Jet Propulsion Laboratory. Retrieved 13 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2433) Sootiyo. Springer Berlin Heidelberg. p. 198. ISBN 978-3-540-00238-3. Retrieved 1 September 2016.
  3. ^ a b c d e f "LCDB Data for (2433) Sootiyo". Asteroid Lightcurve Database (LCDB). Retrieved 1 September 2016.
  4. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 1 September 2016.
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 September 2016.
  6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 1 September 2016.
  7. ^ a b Angeli, C. A.; Guimarã; es, T. A.; Lazzaro, D.; Duffard, R.; Fernández, S.; et al. (April 2001). "Rotation Periods for Small Main-Belt Asteroids From CCD Photometry". The Astronomical Journal. 121 (4): 2245–2252. Bibcode:2001AJ....121.2245A. doi:10.1086/319936. Retrieved 1 September 2016.
  8. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (2433) Sootiyo". Geneva Observatory. Retrieved 1 September 2016.
  9. ^ a b c Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 – Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 September 2016.
  10. ^ a b "2433 Sootiyo (1981 GJ)". Minor Planet Center. Retrieved 1 September 2016.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 September 2016.

External links[edit]