2433 Sootiyo
Discovery [1]
Discovered byE. Bowell
Discovery siteAnderson Mesa Stn.
Discovery date5 April 1981
Designations
(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
Eccentricity0.2220
4.21 yr (1,537 days)
195.45°
0° 14m 3.48s / day
Inclination10.366°
188.27°
71.294°
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][lower-alpha 1]
7.2298±0.0002 h[8]
0.156±0.009[6]
0.20 (assumed)[3]
0.2690±0.0630[5]
0.304±0.062[1][4]
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

    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

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

    Rotation period

    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][lower-alpha 1]

    Diameter and albedo

    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]

    Naming

    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]

    Notes

    1. 1 2 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)

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 2433 Sootiyo (1981 GJ)" (2017-03-05 last obs.). Jet Propulsion Laboratory. Retrieved 13 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(2433) Sootiyo". Dictionary of Minor Planet Names – (2433) Sootiyo. Springer Berlin Heidelberg. p. 198. doi:10.1007/978-3-540-29925-7_2434. ISBN 978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (2433) Sootiyo". Asteroid Lightcurve Database (LCDB). Retrieved 1 September 2016.
    4. 1 2 3 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. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    6. 1 2 3 4 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. (online, AcuA catalog p. 153)
    7. 1 2 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. 1 2 3 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. 1 2 "2433 Sootiyo (1981 GJ)". Minor Planet Center. Retrieved 1 September 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 September 2016.
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