Astronomy:1364 Safara

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1364 Safara
001364-asteroid shape model (1364) Safara.png
Modelled shape of Safara from its lightcurve
Discovery[1]
Discovered byL. Boyer
Discovery siteAlgiers Obs.
Discovery date18 November 1935
Designations
(1364) Safara
Named afterAndré Safar[2]
(discoverer's acquaintance)
1935 VB · 1932 EK
Minor planet categorymain-belt · (outer) · Eos[3][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc85.64 yr (31,279 days)
|{{{apsis}}}|helion}}3.2114 AU
|{{{apsis}}}|helion}}2.8133 AU
3.0124 AU
Eccentricity0.0661
Orbital period5.23 yr (1,910 days)
Mean anomaly8.7502°
Mean motion0° 11m 18.6s / day
Inclination11.488°
Longitude of ascending node63.986°
220.38°
Physical characteristics
Dimensions21.197±0.201 km[5]
21.508±0.266 km[6]
24.35±0.47 km[7]
25.73 km (calculated)[3]
32.63±0.46 km[8]
Rotation period7.14908±0.0004 h[9]
7.25±0.05 h[10][lower-alpha 1]
Geometric albedo0.087±0.012[8]
0.14 (assumed)[3]
0.173±0.007[7]
0.2231±0.0149[6]
L[11] · S (assumed)[3]
Absolute magnitude (H)10.60[6][7] · 10.64±0.19[11] · 10.70[1][3][8]


1364 Safara, incorrectly designated 1935 VB, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 18 November 1935, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa.[12] The asteroid should have been designated 1935 WB, as the letter "V" only covers discoveries made during 1–15 November.[1] It was named after André Safar, presumably an acquaintance of the discoverer from Algiers.[2]

Orbit and classification

Safara is a member the Eos family (606),[4] the largest asteroid family of the outer main belt consisting of nearly 10,000 asteroids.[13]:23 It orbits the Sun at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,910 days; semi-major axis of 3.01 AU). Its orbit has an eccentricity of 0.07 and an inclination of 11° with respect to the ecliptic.[1]

The asteroid was first identified as 1932 EK at Heidelberg Observatory in March 1932. The body's observation arc begins at Algiers with its official discovery observation in November 1935.[12]

Physical characteristics

The Collaborative Asteroid Lightcurve Link (CALL) assumes Safara to be a stony S-type asteroid,[3] while it has also characterized as a rare L-type asteroid by Pan-STARRS photometric survey.[11] The overall spectral type of the Eos family is that of a K-type.[13]:23

Rotation period and poles

In February 2002, a rotational lightcurve of Safara was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory (716) in Colorado. Lightcurve analysis gave a rotation period of 7.25 hours with a brightness amplitude of 0.36 magnitude ({{{1}}}).[10][lower-alpha 1]

In 2018, the body's lightcurve has also been modeled in a focused study of Eoan asteroids. Modeling gave a period of 7.14908 hours and two spin axis in ecliptic coordinates (λ, β) of (197.0°, 32.0°) and (10.0°, 12.0°).[9]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Safara measures between 21.197 and 32.63 kilometers in diameter and its surface has an albedo between 0.087 and 0.2231.[5][6][7][8]

CALL assumes an albedo of 0.14 – derived from 221 Eos, the family's largest member and namesake – and calculates a diameter of 25.73 kilometers based on an absolute magnitude of 10.7.[3]

Naming

This minor planet was named after André Safar, presumably an acquaintance of the discoverer from Algiers. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 124).[2]

Notes

  1. ↑ 1.0 1.1 Lightcurve plot of 1364 Safara, Palmer Divide Observatory, Brian D. Warner (2010) Summary figures at the LCDB

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 1364 Safara (1935 VB)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001364. Retrieved 15 November 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1364) Safara". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 111. doi:10.1007/978-3-540-29925-7_1365. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1364) Safara". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1364%7CSafara. Retrieved 15 November 2017. 
  4. ↑ 4.0 4.1 "Asteroid 1364 Safara – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1364+Safara#Asteroid%201364%20SafaraEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 26 October 2019. 
  5. ↑ 5.0 5.1 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 15 November 2017. 
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 15 November 2017. 
  9. ↑ 9.0 9.1 Hanus, J.; Delbo', M.; Alí-Lagoa, V.; Bolin, B.; Jedicke, R.; Durech, J. et al. (January 2018). "Spin states of asteroids in the Eos collisional family". Icarus 299: 84–96. doi:10.1016/j.icarus.2017.07.007. Bibcode: 2018Icar..299...84H. 
  10. ↑ 10.0 10.1 Warner, Brian D. (July 2010). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 December - 2010 March". The Minor Planet Bulletin 37 (3): 112–118. ISSN 1052-8091. Bibcode: 2010MPBu...37..112W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37..112W. Retrieved 15 November 2017. 
  11. ↑ 11.0 11.1 11.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 15 November 2017. 
  12. ↑ 12.0 12.1 "1364 Safara (1935 VB)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1364. Retrieved 15 November 2017. 
  13. ↑ 13.0 13.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N. 

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