1302 Werra

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1302 Werra
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date28 September 1924
Designations
(1302) Werra
Named after
 Werra [2]
(river in central Germany)
1924 SV ·1930 WD
main-belt  ·(outer)
Themis [3] [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 93.10 yr (34,003 days)
Aphelion 3.6580 AU
Perihelion 2.5677 AU
3.1128 AU
Eccentricity 0.1751
5.49 yr (2,006 days)
251.95°
0° 10m 46.2s / day
Inclination 2.5958°
90.142°
354.64°
Physical characteristics
Dimensions24.35±6.54 km [5]
31.04 km (calculated) [3]
32.18±0.50 km [6]
34.542±0.258 km [7]
35.041±0.114 km [8]
48 h (retracted) [9]
0.0710±0.0158 [7]
0.076±0.006 [8]
0.08 (assumed) [3]
0.10±0.07 [5]
0.102±0.004 [6]
C (assumed) [3]
10.60 [6]  ·10.8 [7]  ·10.90 [1] [3] [5]  ·10.99±0.27 [10]

    1302 Werra, provisional designation 1924 SV, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 28 September 1924, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. [11] The asteroid was named for the river Werra in central Germany. [2]

    Contents

    Orbit and classification

    Werra is a Themistian asteroid that belongs to the Themis family ( 602 ), [3] [4] a very large family of carbonaceous asteroids, named after its parent body 24 Themis. [12]

    It orbits the Sun in the outer main-belt at a distance of 2.6–3.7  AU once every 5 years and 6 months (2,006 days; semi-major axis of 3.11 AU). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic. [1] The body's observation arc begins at Heidelberg with its official discovery observation in September 1924. [11]

    Physical characteristics

    Werra is an assumed carbonaceous C-type asteroid, [3] which is the overall spectral type for members of the Themis family. [12] : 23 

    Rotation period

    In March 2009, a fragmentary lightcurve of Werra was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a poorly constraint rotation period of 2 days with a brightness amplitude of less than 0.1 magnitude. [9] The result was later retracted at the Lightcurve Data Base ( U=n.a. ). As of 2017, no secure period has been obtained. [3]

    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, Werra measures between 24.35 and 35.041 kilometers in diameter and its surface has an albedo between 0.0710 and 0.102. [5] [6] [7] [8]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 31.04 kilometers based on an absolute magnitude of 10.9. [3]

    Naming

    This minor planet was named after the river Werra in central Germany. It merges the Fulda in Hannoversch-Münden, Lower Saxony, to form the river Weser. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 119 ). [2]

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1302 Werra (1924 SV)" (2017-11-02 last obs.). Jet Propulsion Laboratory . Retrieved 11 December 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1302) Werra". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 107. doi:10.1007/978-3-540-29925-7_1303. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 7 8 9 "LCDB Data for (1302) Werra". Asteroid Lightcurve Database (LCDB). Retrieved 11 December 2017.
    4. 1 2 "Asteroid 1302 Werra – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. 1 2 3 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 11 December 2017.
    6. 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)
    7. 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.
    8. 1 2 3 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.
    9. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1302) Werra". Geneva Observatory. Retrieved 11 December 2017.
    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 11 December 2017.
    11. 1 2 "1302 Werra (1924 SV)". Minor Planet Center. Retrieved 11 December 2017.
    12. 1 2 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.
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