3724 Annenskij

3724 Annenskij, provisional designation 1979 YN8, is a stony Gefionian asteroid from the central regions of the asteroid belt, approximately 14 kilometers (9 miles) in diameter. It was discovered on 23 December 1979, by Soviet astronomer Lyudmila Zhuravleva at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[1] The S-type asteroid has a rotation period of 3.97 hours.[11] It was named for Russian poet Innokenty Annensky.[1]

3724 Annenskij
Discovery [1]
Discovered byL. Zhuravleva
Discovery siteCrimean Astrophysical Obs.
Discovery date23 December 1979
Designations
(3724) Annenskij
Named after
Innokenty Annensky [1]
(Russian poet)
1979 YN8 · 1933 XB
1955 QQ · 1965 YM
1969 RF2 · 1974 VM2
1980 AE · 1985 DF1
main-belt [1][2] · (middle)
Gefion [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc84.28 yr (30,783 d)
Aphelion3.2198 AU
Perihelion2.3123 AU
2.7660 AU
Eccentricity0.1640
4.60 yr (1,680 d)
176.15°
0° 12m 51.48s / day
Inclination7.7351°
269.19°
117.85°
Physical characteristics
Mean diameter
12.09±2.86 km[4]
13.55±0.37 km[5]
13.74±0.47 km[6]
14.15±1.3 km[7]
15.229±0.114 km[8]
15.386±0.248 km[9]
3.969±0.001 h[10]
3.974±0.002 h[10]
0.1744±0.0145[8]
0.19±0.09[4]
0.2021 (derived)[11]
0.2022±0.043[7]
0.227±0.013[5]
0.235±0.028[6]
S (family-based)[12]
11.47±0.33[13]
11.50[6]
11.60[2][5][7][8][11]
12.00[4]

    Orbit and classification

    Annenskij is a member of the Gefion family (516),[3] a large asteroid family in the intermediate asteroid belt, named after 1272 Gefion.[12] It is also known as the Ceres or Minerva family.

    It orbits the Sun in the central main-belt at a distance of 2.3–3.2 AU once every 4 years and 7 months (1,680 days; semi-major axis of 2.77 AU). Its orbit has an eccentricity of 0.16 and an inclination of 8° with respect to the ecliptic.[2] The body's observation arc begins with its first observation as 1933 XB at Heidelberg Observatory in December 1933, or 46 years prior to its official discovery observation at Nauchnij.[1]

    Physical characteristics

    Based on its classification into the Gefion family, Annenskij is a stony S-type asteroid.[12]:23

    Rotation period

    Two rotational lightcurves of Annenskij were obtained from photometric observations by Italian and French amateur astronomers Silvano Casulli, Laurent Bernasconi and Cyril Cavadore . Lightcurve analysis gave a rotation period of 3.969 and 3.974 hours with a brightness amplitude of 0.30 and 0.28 magnitude (U=3-/3).[10]

    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 Wide-field Infrared Survey Explorer, Annenskij measures between 12.09 and 15.386 kilometers in diameter and its surface has an albedo between 0.1744 and 0.235.[4][5][6][7][8][9]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2021 and a diameter of 14.15 kilometers based on an absolute magnitude of 11.6.[11]

    Naming

    This minor planet was named after Russian poet and writer Innokenty Annensky (1855–1909).[1] The official naming citation was published by the Minor Planet Center on 4 June 1993 (M.P.C. 22246) with a correction on Annensky's date of death published on 4 February 1996 (M.P.C. 26439).[14]

    References
    1. "3724 Annenskij (1979 YN8)". Minor Planet Center. Retrieved 4 May 2018.
    2. "JPL Small-Body Database Browser: 3724 Annenskij (1979 YN8)" (2018-03-27 last obs.). Jet Propulsion Laboratory. Retrieved 4 May 2018.
    3. "Asteroid 3724 Annenskij – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    4. 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.
    5. 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)
    6. 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.
    7. 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.
    8. 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. (catalog)
    9. 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.
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (3724) Annenskij". Geneva Observatory. Retrieved 4 May 2018.
    11. "LCDB Data for (3724) Annenskij". Asteroid Lightcurve Database (LCDB). Retrieved 4 May 2018.
    12. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    13. 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.
    14. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 May 2018.

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