1032 Pafuri

1032 Pafuri, provisional designation 1924 SA, is a dark background asteroid from the outer regions of the asteroid belt, approximately 65 kilometers (40 miles) in diameter. It was discovered on 30 May 1924, by English astronomer Harry Edwin Wood at the Union Observatory in Johannesburg, South Africa.[1] The asteroid was named for the river in the Pafuri Triangle in South Africa, created by the confluence of the Limpopo and Levubu rivers.[2] The body's spectral type and rotation period are still poorly determined.

1032 Pafuri
Modelled shape of Pafuri, from its lightcurve
Discovery [1]
Discovered byH. E. Wood
Discovery siteJohannesburg Obs.
Discovery date30 May 1924
Designations
(1032) Pafuri
Named after
Pafuri Triangle/River [2]
(in South Africa)
1924 SA · 1937 XB
1947 SA · 1961 AQ
1965 YJ · A917 CC
main-belt [1][3] · (outer) [4]
background [5]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc100.95 yr (36,873 d)
Aphelion3.5799 AU
Perihelion2.6806 AU
3.1303 AU
Eccentricity0.1436
5.54 yr (2,023 d)
317.36°
0° 10m 40.8s / day
Inclination9.4808°
76.322°
189.23°
Physical characteristics
Mean diameter
54.61 km (derived)[4]
54.67±3.4 km[6]
62.60±0.81 km[7]
65.658±0.280 km[8]
68.74±24.54 km[9]
70.27±18.94 km[10]
75.265±0.792 km[11]
13 h (at least)[12]
24 h (at least)[13]
0.0312±0.0055[11]
0.04±0.01[10]
0.04±0.06[9]
0.042±0.009[8]
0.046±0.001[7]
0.0540 (derived)[4]
0.0591±0.008[6]
SMASS = X [3] · P [11]
C (assumed)[4]
10.00[3][6][7][11]
10.10[4][10] · 10.17[9]
10.41±0.53[14]

    Orbit and classification

    Pafuri is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the outer main-belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,023 days; semi-major axis of 3.13 AU). Its orbit has an eccentricity of 0.14 and an inclination of 9° with respect to the ecliptic.[3]

    The asteroid was first observed as A917 CC at Heidelberg Observatory in February 1917, where the body's observation arc begins in April 1929, nearly 5 years after its official discovery observation at Johannesburg.[1]

    Naming

    This minor planet was named after the river in the Pafuri Triangle, created by the confluence of the Limpopo and Levubu rivers in South Africa.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 98).[2]

    Physical characteristics

    In the SMASS classification, Pafuri is an X-type asteroid,[3] while the Wide-field Infrared Survey Explorer (WISE) characterized it as a primitive and darker P-type asteroid.[11] The Collaborative Asteroid Lightcurve Link assumes it to be a carbonaceous C-type asteroid.[4]

    Rotation period

    In November 2009, a rotational lightcurve of Pafuri was obtained from photometric observations by French amateur astronomer Pierre Antonini who suspects it to be a slow rotator.[13] Lightcurve analysis gave a rotation period of at least 24 hours with a brightness variation of more than 0.15 magnitude (U=n.a.).[13] The result supersedes a previous period of at least 13 hours at the Oakley Observatory in the United States (U=n.a.).[12] As of 2018, no secure rotation period has been obtained.[4]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Pafuri measures between 54.67 and 75.265 kilometers in diameter and its surface has an albedo between 0.0312 and 0.0591.[6][7][8][9][10][11] CALL derives an albedo of 0.0540 and a diameter of 54.61 kilometers based on an absolute magnitude of 10.1.[4]

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    References
    1. "1032 Pafuri (1924 SA)". Minor Planet Center. Retrieved 19 March 2018.
    2. Schmadel, Lutz D. (2007). "(1032) Pafuri". Dictionary of Minor Planet Names – (1032) Pafuri. Springer Berlin Heidelberg. p. 89. doi:10.1007/978-3-540-29925-7_1033. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 1032 Pafuri (1924 SA)" (2018-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 19 March 2018.
    4. "LCDB Data for (1032) Pafuri". Asteroid Lightcurve Database (LCDB). Retrieved 19 March 2018.
    5. "Asteroid 1032 Pafuri – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 24 October 2019.
    6. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    7. 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 17 October 2019. (online, AcuA catalog p. 153)
    8. 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.
    9. Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 19 March 2018.
    10. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 19 March 2018.
    11. 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.
    12. Hawkins, Scot; Ditteon, Richard (March 2008). "Asteroid Lightcurve Analysis at the Oakley Observatory - May 2007". The Minor Planet Bulletin. 35 (1): 1–4. Bibcode:2008MPBu...35....1H. ISSN 1052-8091. Retrieved 19 March 2018.
    13. Behrend, Raoul. "Asteroids and comets rotation curves – (1032) Pafuri". Geneva Observatory. Retrieved 19 March 2018.
    14. 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 19 March 2018.
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