1525 Savonlinna

1525 Savonlinna, provisional designation 1939 SC, is an asteroid from the central region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 18 September 1939, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in southwestern Finland.[11] It was later named after the eastern Finnish town Savonlinna.[2]

1525 Savonlinna
Discovery [1]
Discovered byY. Väisälä
Discovery siteTurku Obs.
Discovery date18 September 1939
Designations
(1525) Savonlinna
Named after
Savonlinna
(Finnish town)[2]
1939 SC · 1930 SE
main-belt · (middle) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc86.61 yr (31,635 days)
Aphelion3.4104 AU
Perihelion1.9885 AU
2.6995 AU
Eccentricity0.2634
4.44 yr (1,620 days)
235.57°
0° 13m 19.92s / day
Inclination5.8589°
279.06°
64.806°
Physical characteristics
Dimensions11.73±2.63 km[4]
12.06 km (derived)[3]
12.18 km (IRAS)[5]
12.23±3.39 km[6]
12.233±0.140 km[7]
14.634±0.002 h[8]
22.8406±0.0296 h[9]
0.045±0.027[7]
0.07±0.04[6]
0.0840 (derived)[3]
0.09±0.10[4]
0.1306±0.020 (IRAS)[5]
S [3]
12.80[4] · 12.87±0.15[10] · 12.9[1][3] · 12.901±0.003 (R)[9] · 13.07[6] · 13.54[7]

    Orbit and classification

    Savonlinna orbits the Sun in the central main-belt at a distance of 2.0–3.4 AU once every 4 years and 5 months (1,620 days). Its orbit has an eccentricity of 0.26 and an inclination of 6° with respect to the ecliptic.[1] It was first identified as 1930 SE at Simeiz Observatory, extending the body's arc length by 9 years prior to its official discovery observation at Turku.[11]

    Physical characteristics

    Rotational period

    In October and December 2010, two rotational lightcurves of Savonlinna were obtained by Gordon Gartrelle at UND and the Palomar Transient Factory in California. Lightcurve analysis gave a divergent rotation period of 14.634 and 22.8406 hours with a brightness variation of 0.52 and 0.50 magnitude, respectively (U=2/2).[8][9]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Savonlinna measures between 11.73 and 12.23 kilometers in diameter and its surface has an albedo between 0.045 and 0.130.[4][5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.084 and a diameter of 12.06 kilometers based on an absolute magnitude of 12.9. It also classifies the body as a S-type asteroid, despite its derived albedo.[3]

    Naming

    This minor planet was named for the eastern Finnish town Savonlinna, located in the heart of the Saimaa lake region.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3929).[12]

    References
    1. "JPL Small-Body Database Browser: 1525 Savonlinna (1939 SC)" (2017-04-28 last obs.). Jet Propulsion Laboratory. Retrieved 5 June 2017.
    2. Schmadel, Lutz D. (2007). "(1525) Savonlinna". Dictionary of Minor Planet Names – (1525) Savonlinna. Springer Berlin Heidelberg. p. 121. doi:10.1007/978-3-540-29925-7_1526. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1525) Savonlinna". Asteroid Lightcurve Database (LCDB). Retrieved 31 December 2016.
    4. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 31 December 2016.
    5. 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.
    6. 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. Retrieved 31 December 2016.
    7. 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 31 December 2016.
    8. Gartrelle, Gordon M. (April 2012). "Lightcurve Results for Eleven Asteroids". The Minor Planet Bulletin. 39 (2): 40%–46. Bibcode:2012MPBu...39...40G. ISSN 1052-8091. Retrieved 31 December 2016.
    9. 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 31 December 2016.
    10. 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. Retrieved 31 December 2016.
    11. "1525 Savonlinna (1939 SC)". Minor Planet Center. Retrieved 31 December 2016.
    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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