1106 Cydonia

1106 CydoniaDiscovery[1]

Discovered by| K. Reinmuth
Discovery site| Heidelberg Obs.
Discovery date| 5 February 1929
Designations

MPC designation

| (1106) Cydonia
Pronunciation| /saɪˈdoʊniə/[5]
Named after| Cydonia (quince)[2]
(flowering plant)

Alternative designations

| 1929 CW
Minor planet category| main-belt * (middle)
Eunomia[3][4]
Orbital characteristics[1]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc| 88.41 yr (32,292 days)
|{{{apsis}}}|helion}}| 2.9246 AU
|{{{apsis}}}|helion}}| 2.2673 AU

Semi-major axis

| 2.5959 AU
Eccentricity| 0.1266
Orbital period| 4.18 yr (1,528 days)
Mean anomaly| 71.500°
Mean motion| 0° 14m 8.16s / day
Inclination| 13.065°
Longitude of ascending node| 328.26°

|{{{apsis}}}|helion}}

| 230.23°
Physical characteristics
Mean diameter| 12.140±0.093 km[6]
12.818±0.182 km[7]
12.95±0.94 km[8]
13.26 km (calculated)[3]
Rotation period| 2.6700±0.0181 h[9]
2.679±0.001 h[10]
Geometric albedo| 0.1719±0.0182[7]
0.21 (assumed)[3]
0.241±0.018[8]

Spectral type

| SMASS = S[1][3]
Absolute magnitude (H)| 11.60[8] * 11.7[3] * 11.8[1] * 12.0[7] * 12.06±0.28[11]

1106 Cydonia (/saɪˈdoʊniə/), provisional designation 1929 CW, is a Eunomian asteroid from the central regions of the asteroid belt, approximately 13 kilometers (8 miles) in diameter. It was discovered on 5 February 1929, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany.[12] The asteroid was named for the fruit-bearing tree Cydonia (quince).[2] The S-type asteroid has a relatively short rotation period of 2.7 hours.[3]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Diameter and albedo
* 3 Naming
* 3.1 Reinmuth's flowers
* 4 References
* 5 External links

## Orbit and classification

Cydonia is a member of the Eunomia family (502),[3][4] a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[13] It orbits the Sun in the central asteroid belt at a distance of 2.3–2.9 AU once every 4 years and 2 months (1,528 days; semi-major axis 2.60 AU). Its orbit has an eccentricity of 0.13 and an inclination of 13° with respect to the ecliptic.[1] The body's observation arc begins with its first and official discovery observation at Heidelberg in February 1929.[12]

## Physical characteristics

In the SMASS classification, Cydonia is a stony S-type asteroid,[1][3] in-line with the Eunomia family's overall spectral type.[13]:23

### Rotation period

In December 2015, a rotational lightcurve of Cydonia was obtained from photometric observations by astronomers at the Etscorn Observatory (719) in New Mexico, United States. Lightcurve analysis gave a well-defined rotation period of 2.679 hours with a brightness variation of 0.28 magnitude ({{{1}}}).[10] In April 2017, Spanish astronomers at Puçol Observatory (J42) and other stations of the APTOG-network measured a similar period of 2.6700 hours and an amplitude of 0.10 magnitude ({{{1}}}).[9]

### Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Cydonia measures between 12.140 and 12.95 kilometers in diameter and its surface has an albedo between 0.1719 and 0.241.[6][7][8]

The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 – derived from 15 Eunomia, the family's parent body and namesake – and calculates a diameter of 13.26 kilometers based on an absolute magnitude of 11.7.[3]

## Naming

This minor planet was named after the genus Cydonia in the family Rosaceae, with the fruit-bearing quince tree as its only member. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 104).[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).[14]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: 1106 Cydonia (1929 CW)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001106.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1106) Cydonia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 94. doi:10.1007/978-3-540-29925-7_1107. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 "LCDB Data for (1106) Cydonia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1106|Cydonia.
4. ↑ 4.0 4.1 "Asteroid 1106 Cydonia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1106+Cydonia#Asteroid 1106 CydoniaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0.
5. ↑ "Cydonia". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/Cydonia.
6. ↑ 6.0 6.1 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M.
7. ↑ 7.0 7.1 7.2 7.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
8. ↑ 8.0 8.1 8.2 8.3 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.
9. ↑ 9.0 9.1 Aznar Macias, Amadeo (July 2017). "Density and Axis-size Relationship of Five Main-belt Asteroids: 2017 January - March". The Minor Planet Bulletin 44 (3): 276–279. ISSN 1052-8091. Bibcode: 2017MPBu...44..276A. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017MPBu...44..276A. Retrieved 28 February 2018.
10. ↑ 10.0 10.1 Klinglesmith, Daniel A. III; Hendrickx, Sebastian; Madden, Karl; Montgomery, Samuel (July 2016). "Asteroid Lightcurves from Estcorn Observatory". The Minor Planet Bulletin 43 (3): 234–239. ISSN 1052-8091. Bibcode: 2016MPBu...43..234K. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..234K. Retrieved 28 February 2018.
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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V.
12. ↑ 12.0 12.1 "1106 Cydonia (1929 CW)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1106.
13. ↑ 13.0 13.1 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 978-0-8165-3213-1. Bibcode: 2015aste.book..297N.
14. ↑ 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.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
* 1106 Cydonia at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1106 Cydonia at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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