1161 Thessalia

1161 ThessaliaDiscovery[1]

Discovered by| K. Reinmuth
Discovery site| Heidelberg Obs.
Discovery date| 29 September 1929
Designations

MPC designation

| (1161) Thessalia
Pronunciation| /θɪˈseɪliə/[4]
Named after| Thessaly (Greek region)[2]

Alternative designations

| 1929 SF * 1931 BB
Minor planet category| main-belt * (outer)
background[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 87.76 yr (32,056 days)
|{{{apsis}}}|helion}}| 3.4488 AU
|{{{apsis}}}|helion}}| 2.8975 AU

Semi-major axis

| 3.1732 AU
Eccentricity| 0.0869
Orbital period| 5.65 yr (2,065 days)
Mean anomaly| 213.02°
Mean motion| 0° 10m 27.84s / day
Inclination| 9.3913°
Longitude of ascending node| 72.567°

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

| 309.20°
Physical characteristics
Dimensions| 21.498±0.184 km[5]
Geometric albedo| 0.065±0.010[6]
Absolute magnitude (H)| 11.2[1]

1161 Thessalia, provisional designation 1929 SF, is a dark background asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 29 September 1929, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory.[7] It was named for the Greek region Thessaly.[2]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Diameter and albedo
* 2.2 Lightcurves
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

Thessalia is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the outer main-belt at a distance of 2.9–3.4 AU once every 5 years and 8 months (2,065 days). Its orbit has an eccentricity of 0.09 and an inclination of 9° with respect to the ecliptic.[1] The body's observation arc begins at Heidelberg, five weeks after its official discovery observation.[7]

## Physical characteristics

### Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Thessalia measures 21.498 kilometers in diameter and its surface has an albedo of 0.065.[5][6]

### Lightcurves

As of 2017, no rotational lightcurve of Thessalia has been obtained from photometric observations. The asteroid's rotation period, poles and shape remain unknown.[8]

## Naming

This minor planet was named for the Thessaly region in eastern Greece. The subsequently numbered minor planet 1162 Larissa was named after the region's capital. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 108).[2]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1161 Thessalia (1929 SF)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001161. Retrieved 7 September 2017.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1161) Thessalia". Dictionary of Minor Planet Names – (1161) Thessalia. Springer Berlin Heidelberg. p. 98. doi:10.1007/978-3-540-29925-7_1162. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 "Asteroid 1161 Thessalia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1161.
4. ↑ Thessalian (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Thessalian (Subscription or UK public library membership required.)
5. ↑ 5.0 5.1 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. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 7 September 2017.
6. ↑ 6.0 6.1 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. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 7 September 2017.
7. ↑ 7.0 7.1 "1161 Thessalia (1929 SF)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1161. Retrieved 7 September 2017.
8. ↑ "LCDB Data for (1161) Thessalia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1161|Thessalia. Retrieved 7 September 2017.

## 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
* 1161 Thessalia at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1161 Thessalia at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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