702 Alauda

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702 Alauda
702Ala-mag13-occult.jpg
702 Alauda as seen an hour after occulting TYC 1920-00620-1[1]
Discovery[2]
Discovered by Joseph Helffrich
Discovery date 26 July 2007
Designations
MPC designation (702) Alauda
Pronunciation /əˈlɔːdə/ ə-LAW-də
1910 KQ
Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 105.76 yr (38628 d)
Aphelion 3.2559 AU (487.08 Gm) (Q)
Perihelion 3.1349 AU (468.97 Gm) (q)
3.1954 AU (478.03 Gm) (a)
Eccentricity 0.018936 (e)
5.71 yr (2086.3 d)
242.49° (M)
0° 10m 21.18s / day (n)
Inclination 20.594° (i)
289.91° (Ω)
349.51° (ω)
Known satellites Pichi üñëm[3]
Earth MOID 2.11897 AU (316.993 Gm)
Jupiter MOID 1.93401 AU (289.324 Gm)
Jupiter Tisserand parameter 3.095
Physical characteristics
Mean radius
97.365±1.6 km
Mass (6.057 ± 0.36)×1018 kg[4]
Mean density
(1.57 ± 0.5) g/cm³[4]
8.3531 h (0.34805 d)
0.0587±0.002[2]
C/B[2]
11.42 to 13.57[5]
7.25[2]

702 Alauda is a large asteroid 195±3 km in diameter.[2] It was discovered in 1910 by Joseph Helffrich from the observatory at Heidelberg University. It is named after the lark (alauda). In 2007, a small moon, named Pichi üñëm, was discovered.

Satellite[edit]

Alauda's satellite Pichi üñëm, provisionally known as S/2007 (702) 1, was discovered from observations using adaptive-optics imaging with the European Southern Observatory (ESO) 8-m Very Large Telescope (VLT) on Cerro Paranal, Chile.[3] It is 5.5 km in diameter and has a projected separation from Alauda of 900 km.[6][7] It was named Pichi üñëm, meaning "little bird" in the Mapuche language of Chile, the country from which the moon was discovered.[8]

Orbital characteristics[edit]

Alauda has been identified as the largest member of a dynamical family.[3] Other members of this family include: 581 Tauntonia, 1101 Clematis, 1838 Ursa, 3139 Shantou, 3325 TARDIS, 4368 Pillmore, 5360 Rozhdestvenskij, 5815 Shinsengumi, and many others.[9] Alauda's moon may be a result of the collision that created the asteroid family.[3]

Physical characteristics[edit]

The discovery of Alauda's moon enabled Alauda's mass to be determined. Rojo and Margot (2010) have estimated its mass to be 6.06×1018 kg with a density of 1.57 g/cm³.[4]

Occultations[edit]

Alauda has been observed to occult stars on several occasions, providing important information on its size and shape. It produced occultations on 2001-07-12 and 2004-04-21.[10] It may have occulted an apparent magnitude 9.5 star in the constellation of Gemini on 2009-10-17 at 08:18 UT.[1] This event should have been visible from Uruguay, Argentina, and Chile.[1]

References[edit]

  1. ^ a b c Steve Preston. "(702) Alauda / TYC 1920-00620-1 event on 2009 Oct 17, 08:18 UT". Asteroid Occultation Updates. Retrieved 2009-10-05. 
  2. ^ a b c d e f "JPL Small-Body Database Browser: 702 Alauda (1910 KQ)" (2009-02-15 last obs). Retrieved 7 May 2016. 
  3. ^ a b c d Margot, Jean-Luc; Rojo, P. (2007). "Discovery of a Satellite to Asteroid Family Member (702) Alauda". American Astronomical Society. 39: 440. Bibcode:2007DPS....39.1608M. 
  4. ^ a b c Rojo, P.; Margot, J. L. (2010). "Mass and Density of the B-type Asteroid (702) Alauda". The Astrophysical Journal. 727 (2): 69. arXiv:1011.6577Freely accessible. Bibcode:2011ApJ...727...69R. doi:10.1088/0004-637X/727/2/69. 
  5. ^ Magnitudes generated with JPL Horizons for the year 1950 through 2100
  6. ^ Daniel W. E. Green (2007-08-02). "Electronic Telegram No. 1016". IAU Central Bureau for Astronomical Telegrams. Retrieved 2011-07-05. 
  7. ^ "Asteroid and Dwarf Planet News". Retrieved 2009-10-06. 
  8. ^ "New Names of Minor Planets" (PDF).  (2.19 MB)
  9. ^ "Opposition dates and magnitudes for 702 family members (2004–2008)". Italian organization of minor planet observers. Retrieved 2009-10-05. 
  10. ^ David Dunham. "Observed asteroidal occultation list". Retrieved 2011-01-27. 

External links[edit]