Astronomy:1101 Clematis

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Short description: Asteroid
1101 Clematis
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date22 September 1928
Designations
(1101) Clematis
Pronunciation/ˈklɛmətɪs/[5]
Named afterκληματίς clēmatis
(flowering plant)[2]
1928 SJ · 1928 WB
1963 TG1 · 1969 TG1
Minor planet categorymain-belt · (outer)[1][3]
Alauda[4]
AdjectivesClematidian
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc89.17 yr (32,571 days)
|{{{apsis}}}|helion}}3.4833 AU
|{{{apsis}}}|helion}}2.9770 AU
3.2302 AU
Eccentricity0.0784
Orbital period5.81 yr (2,120 days)
Mean anomaly151.11°
Mean motion0° 10m 11.28s / day
Inclination21.424°
Longitude of ascending node201.98°
107.54°
Physical characteristics
Dimensions29.13±1.62 km[6]
29.65±1.21 km[7]
33.765±0.809 km[7]
37.60 km (derived)[3]
37.86±1.4 km[8]
Rotation period6 h[9]
8.5994±0.0006 h[9]
8.61±0.02 h[9]
12.68±0.01 h[10]
34.3±0.1 h[11][lower-alpha 1]
Geometric albedo0.0788 (derived)[3]
0.1124±0.009[8]
0.127±0.019[7]
0.190±0.023[6]
C (assumed)[3]
Absolute magnitude (H)10.10[6][8] · 10.50[3][7] · 10.6[1] · 10.64±0.28[12]


1101 Clematis /ˈklɛmətɪs/ is an Alauda asteroid from the outermost regions of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 22 September 1928, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany, and assigned the provisional designation 1928 SJ.[13] It was named for the flowering plant Clematis. The presumably carbonaceous asteroid has a relatively long rotation period of 34.3 hours.

Orbit and classification

Clematis is a member of the Alauda family (902),[4] a large family of typically "bright" carbonaceous asteroids and named after its parent body, 702 Alauda.[14]:23 According to a different study, this object is also the namesake of the Clematis family, a small family of 5–16 asteroids hence they may have arisen from the same collisional event. All members have a relatively high orbital inclination.[15]

It orbits the Sun in the outermost asteroid belt at a distance of 3.0–3.5 AU once every 5 years and 10 months (2,120 days; semi-major axis of 3.23 AU). Its orbit has an eccentricity of 0.08 and an inclination of 21° with respect to the ecliptic.[1]

The body's observation arc begins with its observation as 1963 TG1 at Goethe Link Observatory in October 1963, more than 35 years after its official discovery observation at Heidelberg.[13]

Physical characteristics

Clematis is an assumed carbonaceous C-type asteroids,[3] while the overall spectral type for members of the Alauda family is that of a somewhat brighter B-type.[14]:23

Rotation period

In September 2009, a rotational lightcurve[lower-alpha 1] of Clematis was obtained from photometric observations by American astronomers Brian Warner at the Palmer Divide Observatory, Colorado, and by Robert Stephens at GMARS (G79, California. Lightcurve analysis gave a synodic rotation period of 34.3 hours with a brightness amplitude of 0.16 magnitude ({{{1}}}),[11] which significantly differs from previously reported periods of 6 to 12.68 hours ({{{1}}}).[9][10] While not being a slow rotator, Clematis has a much longer period than that known for most other asteroids, and its small amplitude is indicative for a rather spheroidal shape.

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, Clematis measures between 29.13 and 37.86 kilometers in diameter and its surface has an albedo between 0.1124 and 0.190.[6][7][8]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0788 and a diameter of 37.60 kilometers based on an absolute magnitude of 10.5.[3]

Naming

This minor planet was named after the flowering plant Clematis, a genus within the Ranunculaceae (buttercup or crowfoot family). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H n.a.).[2]

Reinmuth's flowers

Due to his many discoveries, Karl Reinmuth submitted a large list of 66 newly named asteroids in the early 1930s. The list covered his discoveries with numbers between (1009) and (1200). This list also contained a sequence of 28 asteroids, starting with 1054 Forsytia, that were all named after plants, in particular flowering plants (also see list of minor planets named after animals and plants).[16]

Notes

  1. ↑ 1.0 1.1 Lightcurve plot of 1101 Clematis, Palmer Divide Observatory, B. D. Warner (2009): rotation period 34.3±0.1 hours with a brightness amplitude of 0.16±0.02 mag. Quality code of 2. Summary figures at the LCDB

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "JPL Small-Body Database Browser: 1101 Clematis (1928 SJ)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001101. Retrieved 12 January 2018. 
  2. ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(1101) Clematis". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 93. doi:10.1007/978-3-540-29925-7_1102. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1101) Clematis". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1101%7CClematis. Retrieved 12 January 2018. 
  4. ↑ 4.0 4.1 "Asteroid 1101 Clematis – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1101+Clematis#Asteroid%201101%20ClematisEAR-A-VARGBDET-5-NESVORNYFAM-V3.0. Retrieved 26 October 2019. 
  5. ↑ clematis (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=clematis  (Subscription or UK public library membership required.)
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  7. ↑ 7.0 7.1 7.2 7.3 7.4 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 12 January 2018. 
  8. ↑ 8.0 8.1 8.2 8.3 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. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019. 
  9. ↑ 9.0 9.1 9.2 9.3 Behrend, Raoul. "Asteroids and comets rotation curves – (1101) Clematis". Geneva Observatory. http://obswww.unige.ch/~behrend/page3cou.html#001101. Retrieved 12 January 2018. 
  10. ↑ 10.0 10.1 Stephens, Robert D. (March 2004). "Photometry of 683 Lanzia, 1101 Clematis, 1499 Pori, 1507 Vaasa, and 3893 DeLaeter". The Minor Planet Bulletin 31 (1): 4–6. ISSN 1052-8091. Bibcode: 2004MPBu...31....4S. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2004MPBu...31....4S. Retrieved 12 January 2018. 
  11. ↑ 11.0 11.1 Warner, Brian D.; Stephens, Robert D. (April 2010). "Analysis of the Lightcurve of 1101 Clematis". The Minor Planet Bulletin 37 (2): 73–74. ISSN 1052-8091. Bibcode: 2010MPBu...37...73W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010MPBu...37...73W. Retrieved 12 January 2018. 
  12. ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 12 January 2018. 
  13. ↑ 13.0 13.1 "1101 Clematis (1928 SJ)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1101. Retrieved 12 January 2018. 
  14. ↑ 14.0 14.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N. 
  15. ↑ Novaković, Bojan; Cellino, Alberto; Knežević, Zoran (November 2011). "Families among high-inclination asteroids". Icarus 216 (1): 69–81. doi:10.1016/j.icarus.2011.08.016. Bibcode: 2011Icar..216...69N. 
  16. ↑ Schmadel, Lutz D. (2007). "(1054) Forsytia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 90. doi:10.1007/978-3-540-29925-7_1055. ISBN 978-3-540-00238-3. 

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