1687 Glarona

1687 Glarona (prov. designation: 1965 SC) is a stony Themis asteroid approximately 34 kilometers in diameter from the outer region of the asteroid belt. It was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, on 19 September 1965.[11] It was later named after the Swiss Canton of Glarus.[2]

1687 Glarona
Shape model of Glarona from its lightcurve
Discovery[1]
Discovered byP. Wild
Discovery siteZimmerwald Obs.
Discovery date19 September 1965
Designations
(1687) Glarona
Pronunciation/ɡləˈroʊnə/
Named after
Glarus (Swiss canton)[2]
1965 SC · 1926 UA
1931 RB1 · 1942 PD
1945 EA · 1948 QN
1948 RD1 · 1954 TB
1954 UB2 · 1959 PG
1960 XD · 1965 UX
A909 UA · A915 XC
main-belt · Themis[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc107.45 yr (39,245 days)
Aphelion3.7148 AU
Perihelion2.6004 AU
3.1576 AU
Eccentricity0.1765
5.61 yr (2,049 days)
62.841°
0° 10m 32.52s / day
Inclination2.6367°
93.570°
316.57°
Physical characteristics
Dimensions31.52±0.50 km[4]
33.93±4.9 km (IRAS:6)[5]
36.75±0.93 km[6]
37.850±0.194[7]
42.007±0.515 km[8]
6.3 h[lower-alpha 1]
6.49595±0.00001 h[9]
0.0795±0.0130[8]
0.107±0.006[6]
0.1219±0.044 (IRAS:6)[5]
0.141±0.021[4][7]
S[3]
B–V = 0.670[1]
U–B = 0.380[1]
10.25[1][3][4][5][6][8] · 10.51±0.28[10]

    Orbit and classification

    The asteroid is a member of the Themis family, one of the larger groups in the outer main-belt. It orbits the Sun at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,049 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1] The first precovery was taken at Heidelberg Observatory in 1909, extending the asteroid's observation arc by 56 years prior to its discovery.[11]

    Naming

    The minor planet was named for of the discoverer's home valley, the Swiss Canton of Glarus and its capital Glarus.[2] Paul Wild (1925–2014) was a prolific discoverer almost 100 asteroids,[12] and is well known for his discovery of comet Wild 2, which was visited by NASA's Stardust mission. The official naming citation was published by the Minor Planet Center on 1 October 1969 (M.P.C. 2971).[13]

    Physical characteristics

    Lightcurves

    A rotational lightcurve obtained in the 1970s gave a well-defined rotation period of 6.3 hours with a brightness amplitude of 0.75 in magnitude (U=3).[lower-alpha 1] In March 2016, a second period was published based on data from the Lowell Photometric Database (LPD). Using lightcurve inversion and convex shape models, as well as distributed computing power and the help of individual volunteers, a period of 6.49595±0.00001 hours could be obtained for this asteroid from the LPD's sparse-in-time photometry data (U=n.a.).[9]

    Diameter and albedo

    According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 31.5 and 42.0 kilometers in diameter and its surface has an albedo in the range of 0.0795 to 0.141.[4][5][6][7][8]

    The Collaborative Asteroid Lightcurve Link (CALL) gives preference to the results obtained by IRAS with an albedo of 0.1219 and a diameter of 33.93 kilometers.[3] CALL also classifies the Themistian asteroid as a stony S-class body, which are otherwise known to have low albedos, showing spectra of carbonaceous C-type bodies (also see Carbonaceous chondrites).[14]

    Notes
    1. Tedesco (1979): rotation period of 6.3 hours with an amplitude in brightness of 0.75 in magnitude. (Tedesco, E.F. (1979) PhD Dissertation, New. Mex. State Univ. 280pp.). Summary figures given at Light curve Database for (1687) Glarona and JPL's Small-Body Database Browser for 1687 Glarona (1965 SC)

    References
    1. "JPL Small-Body Database Browser: 1687 Glarona (1965 SC)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
    2. Schmadel, Lutz D. (2007). "(1687) Glarona". Dictionary of Minor Planet Names – (1687) Glarona. Springer Berlin Heidelberg. p. 134. doi:10.1007/978-3-540-29925-7_1688. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1687) Glarona". Asteroid Lightcurve Database (LCDB). Retrieved 15 May 2016.
    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. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 15 May 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 – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
    6. 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)
    7. 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. Retrieved 8 December 2016.
    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. Retrieved 15 May 2016.
    9. Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 1 April 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 15 May 2016.
    11. "1687 Glarona (1965 SC)". Minor Planet Center. Retrieved 15 May 2016.
    12. "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 15 May 2016.
    13. 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.
    14. Rivkin, A. S.; Howell, E. S.; Bus, S. J. (March 2004). "Diversity of Types of Hydrated Minerals on C-Class Asteroids" (PDF). 35th Lunar and Planetary Science Conference: 1646. Bibcode:2004LPI....35.1646R. Retrieved 11 November 2015.

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