703 Noëmi

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703 Noëmi
Discovery [1]
Discovered by J. Palisa
Discovery site Vienna Obs.
Discovery date 3 October 1910
MPC designation (703) Noëmi
Named after
Valentine Noémi von Rothschild
(daughter of Baron Rothschild)[2]
1910 KT
main-belt · Flora[3][4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 106.48 yr (38,891 days)
Aphelion 2.4744 AU
Perihelion 1.8748 AU
2.1746 AU
Eccentricity 0.1379
3.21 yr (1,171 days)
0° 18m 26.28s / day
Inclination 2.4579°
Physical characteristics
Dimensions 7.250±0.273 km[5][6]
8.58 km (calculated)[3]
9.85±1.42 km[7]
201.8±2.0 h[a]
0.24 (assumed)[3]
12.10[5] · 12.33±0.24[8] · 12.40[6] · 12.5[1][3] · 12.70[7]

703 Noëmi, provisional designation 1910 KT, is a stony Florian asteroid and possible slow rotator from the inner regions of the asteroid belt, approximately 8.5 kilometers in diameter. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 3 October 1910.[9] The asteroid was likely named for Valentine Noémi von Rothschild, daughter of Baron Rothschild.[2]

Orbit and classification[edit]

Noëmi is a member of the Flora family, the 3rd largest main-belt asteroid family with nearly 14,000 known members.[4]:23

This asteroid orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,171 days). Its orbit has an eccentricity of 0.14 and an inclination of 2° with respect to the ecliptic.[1] The body's observation arc begins at Vienna, 3 days after its official discovery observation.[9]

Physical characteristics[edit]

Noëmi has been characterized as a common stony S-type asteroid based on its classification to the Flora family.[3]


In December 2016, a rotational lightcurve of Noëmi was obtained from photometric observations. Lightcurve analysis gave a rotation period of 201.8±2.0 hours with a brightness variation of 0.8 magnitude (U=n.a.),[a] superseding a previous inconclusive observation by French amateur astronomer Pierre Antonini from February 2011.[10]

The lightcurve's large amplitude of 0.8 magnitude is typically indicative of a non-spheroidal shape (an elongated, irregular shape). As of July 2017, the asteroid is only a possible slow rotator as the lightcurve's quality has not been rated.[3]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Noëmi measures between 7.250 and 9.85 kilometers in diameter and its surface has an albedo between 0.19 and 0.486.[5][6][7]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 8.58 kilometers based on an absolute magnitude of 12.5.[3]


According to A. Schnell, this minor planet was probably named for Baroness Valentine Noémi von Rothschild (1886–1969) to celebrate her engagement to Baron Sigismund von Springer (1873–1927). Noémi von Rothschild's father, Baron Rothschild, had recently donated a stereocomparator to the Vienna Observatory. The official naming was first published in the Astronomische Nachrichten in 1912 (AN 190).[2]


  1. ^ a b Noschese (2017) web: rotation period 201.8±2.0 hours with a brightness amplitude of 0.8 mag. Summary figures for (703) Noëmi at Collaborative Asteroid Lightcurve Link (CALL)


  1. ^ a b c d "JPL Small-Body Database Browser: 703 Noemi (1910 KT)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 26 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (703) Noëmi. Springer Berlin Heidelberg. p. 68. ISBN 978-3-540-00238-3. Retrieved 26 July 2017. 
  3. ^ a b c d e f g h "LCDB Data for (703) Noëmi". Asteroid Lightcurve Database (LCDB). Retrieved 26 July 2017. 
  4. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. Bibcode:2015aste.book..297N. arXiv:1502.01628Freely accessible. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 23 June 2017. 
  5. ^ 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 26 July 2017. 
  6. ^ a b c d 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. Bibcode:2012ApJ...759L...8M. arXiv:1209.5794Freely accessible. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 July 2017. 
  7. ^ a b c d 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. Bibcode:2016AJ....152...63N. arXiv:1606.08923Freely accessible. doi:10.3847/0004-6256/152/3/63. Retrieved 26 July 2017. 
  8. ^ 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762Freely accessible. doi:10.1016/j.icarus.2015.08.007. Retrieved 26 July 2017. 
  9. ^ a b "703 Noemi (1910 KT)". Minor Planet Center. Retrieved 26 July 2017. 
  10. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (703) Noëmi". Geneva Observatory. Retrieved 26 July 2017. 

External links[edit]