1101 Clematis

1101 Clematis
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date22 September 1928
Designations
(1101) Clematis
Pronunciation/ˈklɛmətɪs/[2]
Named after
κληματίς clēmatis
(flowering plant)[3]
1928 SJ · 1928 WB
1963 TG1 · 1969 TG1
main-belt · (outer)[1][4]
Alauda[5]
AdjectivesClematidian
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc89.17 yr (32,571 days)
Aphelion3.4833 AU
Perihelion2.9770 AU
3.2302 AU
Eccentricity0.0784
5.81 yr (2,120 days)
151.11°
0° 10m 11.28s / day
Inclination21.424°
201.98°
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)[4]
37.86±1.4 km[8]
6 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][a]
0.0788 (derived)[4]
0.1124±0.009[8]
0.127±0.019[7]
0.190±0.023[6]
C (assumed)[4]
10.10[6][8] · 10.50[4][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),[5] 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,[4] 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[a] 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 (U=2),[11] which significantly differs from previously reported periods of 6 to 12.68 hours (U=1/2/2/2).[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.[4]

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.).[3]

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. ^ a b 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. ^ a b c d e "JPL Small-Body Database Browser: 1101 Clematis (1928 SJ)" (2017-11-25 last obs.). Jet Propulsion Laboratory. Retrieved 12 January 2018.
  2. ^ "clematis". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. ^ a b 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.
  4. ^ a b c d e f g "LCDB Data for (1101) Clematis". Asteroid Lightcurve Database (LCDB). Retrieved 12 January 2018.
  5. ^ a b "Asteroid 1101 Clematis – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
  6. ^ a b c d 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. ^ a b c d e 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. S2CID 46350317. Retrieved 12 January 2018.
  8. ^ a b c d 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.
  9. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (1101) Clematis". Geneva Observatory. Retrieved 12 January 2018.
  10. ^ a b 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. Bibcode:2004MPBu...31....4S. ISSN 1052-8091. Retrieved 12 January 2018.
  11. ^ a b Warner, Brian D.; Stephens, Robert D. (April 2010). "Analysis of the Lightcurve of 1101 Clematis". The Minor Planet Bulletin. 37 (2): 73–74. Bibcode:2010MPBu...37...73W. ISSN 1052-8091. 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. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. S2CID 53493339. Retrieved 12 January 2018.
  13. ^ a b "1101 Clematis (1928 SJ)". Minor Planet Center. Retrieved 12 January 2018.
  14. ^ a b 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. S2CID 119280014.
  15. ^ Novaković, Bojan; Cellino, Alberto; Knežević, Zoran (November 2011). "Families among high-inclination asteroids". Icarus. 216 (1): 69–81. arXiv:1108.3740. Bibcode:2011Icar..216...69N. doi:10.1016/j.icarus.2011.08.016. S2CID 54772591.
  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.