Astronomy:2023 Asaph

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2023 Asaph
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date16 September 1952
Designations
(2023) Asaph
Named afterAsaph Hall
(American astronomer)[2]
1952 SA
Minor planet categorymain-belt · (outer)[3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc64.53 yr (23,571 days)
|{{{apsis}}}|helion}}3.6816 AU
|{{{apsis}}}|helion}}2.0703 AU
2.8760 AU
Eccentricity0.2801
Orbital period4.88 yr (1,781 days)
Mean anomaly98.697°
Mean motion0° 12m 7.56s / day
Inclination22.352°
Longitude of ascending node3.1290°
357.53°
Physical characteristics
Dimensions19.678±0.264 km[4][5]
20.56±0.43 km[6]
21.29±0.40 km[7]
25.44 km (calculated)[3]
Rotation period3.87±0.02 h[8][lower-alpha 1]
4.74±0.01 h[9]
9.19±0.05 h[10]
Geometric albedo0.057 (assumed)[3]
0.090±0.004[7]
0.096±0.018[6][5]
0.1045±0.0204[4]
C [3]
Absolute magnitude (H)11.6[4][6][7] · 11.7[1][3]


2023 Asaph, provisional designation 1952 SA, is a dark asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter.[6] It was discovered on 16 September 1952, by astronomers of the Indiana Asteroid Program at Goethe Link Observatory in Indiana, United States.[11]

Orbit and classification

Asaph orbits the Sun in the outer main-belt at a distance of 2.1–3.7 AU once every 4 years and 11 months (1,781 days). Its orbit has an eccentricity of 0.28 and an inclination of 22° with respect to the ecliptic.[1] The asteroid's observation arc begins with its official discovery observation Goethe Link.[11]

Physical characterization

In November 2001, a rotational lightcurve of Asaph was obtained from photometric observations by American astronomer Brian Warner. Lightcurve analysis gave a rotation period of 4.74 hours with a low brightness variation of 0.06 magnitude ({{{1}}}).[9] Upon re-examination of the revised data set, Warner constructed a new, ambiguous lightcurve with two possible period solutions of 3.87 and 6.28 hours ({{{1}}}).[8][lower-alpha 1] These observations supersede a period of 9.19 hours derived from two fragmentary lightcurves obtained in 2001 and 2006, respectively ({{{1}}}).[10]

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, Asaph measures between 19.678 and 21.29 kilometers in diameter and its surface has an albedo between 0.09 and 0.1045.[4][5][6][7]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a larger diameter of 25.44 kilometers based on an absolute magnitude of 11.7.[3]

Naming

This minor planet was named in memory of American astronomer Asaph Hall (1829–1907), who discovered the Martian satellites, Phobos and Deimos.[2] The official naming citation was published by the Minor Planet Center on 15 October 1977 (M.P.C. 4238).[12]

Notes

  1. ↑ 1.0 1.1 Lightcurve plot of 2023 Asaph, Palmer Divide Observatory, Brian Warner (2001). The lightcurve is ambiguous with two possible period solutions of 6.28±0.05 and 3.87±0.02 hours.

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 2023 Asaph (1952 SA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002023. 
  2. ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(2023) Asaph". Dictionary of Minor Planet Names – (2023) Asaph. Springer Berlin Heidelberg. p. 164. doi:10.1007/978-3-540-29925-7_2024. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (2023) Asaph". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2023%7CAsaph. 
  4. ↑ 4.0 4.1 4.2 4.3 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. 
  5. ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 6 July 2017. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 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 6 July 2017. 
  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 Warner, Brian D. (October 2010). "Upon Further Review: II. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". The Minor Planet Bulletin 37 (4): 150–151. ISSN 1052-8091. Bibcode: 2010MPBu...37..150W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37..150W. Retrieved 6 July 2017. 
  9. ↑ 9.0 9.1 Warner, Brian D. (September 2003). "Lightcurve analysis of asteroids 331, 795, 886, 1266, 2023, 3285, and 3431". The Minor Planet Bulletin 30 (3): 61–64. ISSN 1052-8091. Bibcode: 2003MPBu...30...61W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2003MPBu...30...61W. Retrieved 6 July 2017. 
  10. ↑ 10.0 10.1 Behrend, Raoul. "Asteroids and comets rotation curves – (2023) Asaph". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#002023. 
  11. ↑ 11.0 11.1 "2023 Asaph (1952 SA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2023. 
  12. ↑ Schmadel, Lutz D.. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. 

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