1319 Disa

1319 Disa
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date 19 March 1934
Designations
MPC designation 1319 Disa
Named after
 Disa
(orchid – flowering plant)[2]
1934 FO · 1929 GE
1970 FM · A908 EA
main-belt · (outer) [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 107.58 yr (39,293 days)
Aphelion 3.6025 AU
Perihelion 2.3668 AU
2.9847 AU
Eccentricity 0.2070
5.16 yr (1,883 days)
247.94°
Inclination 2.8002°
256.19°
316.50°
Physical characteristics
Dimensions 24.00±0.37 km[4]
25.894±0.180 km[5]
16.88±1.12 km[6]
42.23 km (calculated)[3]
7.080 h[7]
7.082±0.001 h[8]
7.0820±0.0077 h[9]
0.116±0.004[4]
0.0959±0.0034[5]
0.391±0.038[6]
0.057 (assumed)[3]
C [3]
10.6

    1319 Disa, provisional designation 1934 FO, is an assumed carbonaceous asteroid from the outer region of the asteroid belt, about 25 kilometers in diameter. It was discovered by English-born, South African astronomer Cyril Jackson at the Union Observatory, Johannesburg, on 19 March 1934.[10]

    The asteroid orbits the Sun at a distance of 2.4–3.6 AU once every 5 years and 2 months (1,883 days). Its orbit shows an eccentricity of 0.21 and is tilted by 3 degrees to the plane of the ecliptic. It has a well-defined rotation period of 7.08 hours.[7][8][9]

    The asteroid is one of the cases, where the Collaborative Asteroid Lightcurve Link (CALL) strongly disagrees with the (interpreted) observational data collected by space-based mission. While publications based on results from the Akari and WISE satellites assign a geometric albedo of 0.10 and 0.11, including and outlier of 0.39, CALL assumes the body to be carbonaceous with an albedo of only 0.06. This leads to notable discrepancies for the body's derived size, where CALL calculates a significantly larger diameter of 42 kilometers, compared to the 17–26 kilometers from the published satellite surveys (also see infobox for an overview).[3][4][5][6]

    The minor planet was named after Disa, also known as "African weed-orchid", a large genus of more than a hundred tropical orchids, common in southern Africa.[2]

    References

    1. 1 2 "JPL Small-Body Database Browser: 1319 Disa (1934 FO)" (2015-10-22 last obs.). Jet Propulsion Laboratory. Retrieved November 2015.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1319) Disa. Springer Berlin Heidelberg. p. 108. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 5 "LCDB Data for (1319) Disa". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 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 November 2015.
    5. 1 2 3 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. Retrieved November 2015.
    6. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015.
    7. 1 2 Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - February - March 2006". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 33 (4): 82–84. Bibcode:2006MPBu...33...82W. ISSN 1052-8091. Retrieved November 2015.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1319) Disa". Geneva Observatory. Retrieved November 2015.
    9. 1 2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved November 2015.
    10. ↑ "1319 Disa (1934 FO)". Minor Planet Center. Retrieved November 2015.

    External links


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