2023 Asaph

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2023 Asaph
Discovery  [1]
Discovered by Indiana University
(Indiana Asteroid Program)
Discovery site Goethe Link Obs.
Discovery date16 September 1952
Designations
(2023) Asaph
Named after
 Asaph Hall
(American astronomer) [2]
1952 SA
main-belt  ·(outer) [3]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 64.53 yr (23,571 days)
Aphelion 3.6816 AU
Perihelion 2.0703 AU
2.8760 AU
Eccentricity 0.2801
4.88 yr (1,781 days)
98.697°
0° 12m 7.56s / day
Inclination 22.352°
3.1290°
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]
3.87±0.02 h [8] [lower-alpha 1]
4.74±0.01 h [9]
9.19±0.05 h [10]
0.057 (assumed) [3]
0.090±0.004 [7]
0.096±0.018 [6] [5]
0.1045±0.0204 [4]
C   [3]
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]

    Contents

    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 ( U=2- ). [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 ( U=2- ). [8] [lower-alpha 1] These observations supersede a period of 9.19 hours derived from two fragmentary lightcurves obtained in 2001 and 2006, respectively ( U=1/1 ). [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 2 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.

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 2023 Asaph (1952 SA)" (2017-03-30 last obs.). Jet Propulsion Laboratory . Retrieved 6 July 2017.
    2. 1 2 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. 1 2 3 4 5 6 "LCDB Data for (2023) Asaph". Asteroid Lightcurve Database (LCDB). Retrieved 6 July 2017.
    4. 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.
    5. 1 2 3 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. arXiv: 1109.4096 . Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68 . Retrieved 6 July 2017.
    6. 1 2 3 4 5 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 6 July 2017.
    7. 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)
    8. 1 2 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. Bibcode:2010MPBu...37..150W. ISSN   1052-8091 . Retrieved 6 July 2017.
    9. 1 2 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. Bibcode:2003MPBu...30...61W. ISSN   1052-8091 . Retrieved 6 July 2017.
    10. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (2023) Asaph". Geneva Observatory . Retrieved 6 July 2017.
    11. 1 2 "2023 Asaph (1952 SA)". Minor Planet Center. Retrieved 6 July 2017.
    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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