1120 Cannonia

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1120 Cannonia
Discovery [1]
Discovered by P. Shajn
Discovery site Simeiz Obs.
Discovery date 11 September 1928
MPC designation (1120) Cannonia
Named after
Annie Jump Cannon
(American astronomer)[2]
1928 RV · 1956 AG
main-belt · (inner)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 74.35 yr (27,155 days)
Aphelion 2.5616 AU
Perihelion 1.8707 AU
2.2161 AU
Eccentricity 0.1559
3.30 yr (1,205 days)
0° 17m 55.32s / day
Inclination 4.0492°
Physical characteristics
Dimensions 8.10±1.25 km[5]
9.92±0.70 km[6]
10.184±0.140 km[7][8]
10.80 km (calculated)[3]
10.80±0.75 km[9]
3.79 h[a]
3.816±0.002 h[10]
0.24 (assumed)[3]
11.90[9] · 12.00[1][3][5] · 12.25±0.39[11] · 12.80[6][8]

1120 Cannonia, provisional designation 1928 RV, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered by Pelageya Shajn at Simeiz in 1928, it was named after American astronomer Annie Jump Cannon.[2]


Cannonia was discovered on 11 September 1928, by Russian astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula.[12] Two days later, it was independently discovered by Grigory Neujmin (also at Simeiz), and ten days later by Eugène Delporte at Uccle Observatory in Belgium.[2] The independent discoveries, however, are not officially acknowledged by the Minor Planet Center.[12]

Orbit and classification[edit]

Cannonia is a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[3][4][13]:23 It orbits the Sun in the inner main-belt at a distance of 1.9–2.6 AU once every 3 years and 4 months (1,205 days). Its orbit has an eccentricity of 0.16 and an inclination of 4° with respect to the ecliptic.[1]

The body's observation arc begins unusually late at Uccle in January 1946, or nearly 18 years after its official discovery observation.[12]

Physical characteristics[edit]

Cannonia is an assumed stony S-type asteroid, according to its family membership.[3][13]:23

Rotation period[edit]

In November 2004, a rotational lightcurve of Cannonia was obtained from photometric observations by American astronomer John Menke at his Menke Observatory in Barnesville, Maryland. Lightcurve analysis gave a well-defined rotation period of 3.816 hours with a brightness amplitude of 0.16 magnitude (U=3).[10] An anonymously submitted lightcurve gave a similar period of 3.79 hours (U=2).[a]

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, Cannonia measures between 8.1 and 10.8 kilometers in diameter and its surface has an albedo between 0.129 and 0.49.[5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.24 – derived from 8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 10.8 kilometers with an absolute magnitude of 12.0.[3]


This minor planet was named after American astronomer Annie Jump Cannon (1863–1941), who developed a taxonomic system of stellar spectral types at Harvard University, and subsequently classified about 225,000 stars with these types for the Henry Draper Catalog.[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 105). She is also honored by the lunar crater Cannon.[2]


  1. ^ a b Anonymous submitted period in 2011, with a rotation period 3.79 hours with a brightness amplitude of 0.15 mag and a quality code of 2. Summary figures for (1120) Cannonia at Collaborative Asteroid Lightcurve Link (CALL)


  1. ^ a b c d "JPL Small-Body Database Browser: 1120 Cannonia (1928 RV)" (2017-07-05 last obs.). Jet Propulsion Laboratory. Retrieved 26 August 2017. 
  2. ^ a b c d e Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1120) Cannonia. Springer Berlin Heidelberg. p. 95. ISBN 978-3-540-00238-3. Retrieved 26 August 2017. 
  3. ^ a b c d e f g h "LCDB Data for (1120) Cannonia". Asteroid Lightcurve Database (LCDB). Retrieved 26 August 2017. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 26 August 2017. 
  5. ^ a b c d 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:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 26 August 2017. 
  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. Retrieved 26 August 2017. 
  7. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 26 August 2017. 
  8. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 26 August 2017. 
  9. ^ 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. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 26 August 2017. 
  10. ^ a b Menke, John (December 2005). "Asteroid lightcurve results from Menke Observatory". The Minor Planet Bulletin. 32 (4): 85–88. Bibcode:2005MPBu...32...85M. ISSN 1052-8091. Retrieved 26 August 2017. 
  11. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 26 August 2017. 
  12. ^ a b c "1120 Cannonia (1928 RV)". Minor Planet Center. Retrieved 26 August 2017. 
  13. ^ a b Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families" (PDF). Asteroids IV: 297–321. arXiv:1502.01628Freely accessible. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. Retrieved 26 August 2017. 

External links[edit]