1807 Slovakia

1807 SlovakiaDiscovery[1]

Discovered by| M. Antal
Discovery site| Skalnaté Pleso Obs.
Discovery date| 20 August 1971
Designations

MPC designation

| (1807) Slovakia
Named after| Slovakia (country)[2]

Alternative designations

| 1971 QA * 1928 UE
1948 UC * 1951 JA
1951 QK * 1954 NA
1960 GB * 1971 TM1
Minor planet category| main-belt * (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 87.74 yr (32,046 days)
|{{{apsis}}}|helion}}| 2.6229 AU
|{{{apsis}}}|helion}}| 1.8289 AU

Semi-major axis

| 2.2259 AU
Eccentricity| 0.1784
Orbital period| 3.32 yr (1,213 days)
Mean anomaly| 283.80°
Mean motion| 0° 17m 48.48s / day
Inclination| 3.4919°
Longitude of ascending node| 236.35°

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

| 140.53°
Physical characteristics
Dimensions| 9.135±0.092 km[4]
9.146±0.059 km[5]
9.40 km (calculated)[3]
Rotation period| 24 h (dated)[6]
308.0±0.3 h[7]
308.6 h[3]
Geometric albedo| 0.20 (assumed)[3]
0.3058±0.0411[5]
0.309±0.073[4]

Spectral type

| SMASS = S[1] * S[3]
Absolute magnitude (H)| 12.1[5] * 12.5[1][3] * 12.61[7] * 13.06±0.93[8]

1807 Slovakia, provisional designation 1971 QA, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 20 August 1971, by Slovak astronomer Milan Antal at Skalnaté pleso Observatory in the High Tatras mountains of Slovakia and named after the Slovak Republic.[2][9]

## Contents

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

## Orbit and classification

The asteroid orbits the Sun in the inner main-belt at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,213 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[1]

It was first identified as 1928 UE at Heidelberg Observatory in 1928, extending the body's observation arc by 43 years prior to its official discovery observation at Skalnaté pleso.[9]

## Physical characteristics

In the SMASS classification, Slovakia is a common stony S-type asteroid.[1]

### Slow rotator

Slovakia has an exceptionally long rotation period of 308 hours with a high brightness variation of 1.10 magnitude ({{{1}}}).[7] The Collaborative Asteroid Lightcurve Link (CALL) adopts a period of 308.6 hours with an amplitude of 1.1 magnitude.[3]

### Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Slovakia measures 9.14 kilometers in diameter, and its surface has an albedo of 0.31,[4][5] while CALL assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.40 kilometers with an absolute magnitude of 12.5[3]

## Naming

This minor planet was named in honor of the now independent state of Slovakia (Slovak Republic), the country where the discovering observatory is located. At the time Slovakia was still part of the socialistic republic of Czechoslovakia that was formed after World War I and lasted until the end of the Cold War (also see 2315 Czechoslovakia).[2] The official naming citation was published by the Minor Planet Center on 15 June 1973 (M.P.C. 3508).[10]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: 1807 Slovakia (1971 QA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001807. Retrieved 3 June 2017.
2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1807) Slovakia". Dictionary of Minor Planet Names – (1807) Slovakia. Springer Berlin Heidelberg. p. 145. doi:10.1007/978-3-540-29925-7_1808. ISBN 978-3-540-00238-3.
3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "LCDB Data for (1807) Slovakia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1807|Slovakia. Retrieved 15 December 2016.
4. ↑ 4.0 4.1 4.2 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 15 December 2016.
5. ↑ 5.0 5.1 5.2 5.3 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.
6. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (1807) Slovakia". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001807. Retrieved 15 December 2016.
7. ↑ 7.0 7.1 7.2 Galad, Adrian; Kornos, Leonard; Husarik, Marek (October 2009). "The Very Long Sidereal Period of 1807 Slovakia". The Minor Planet Bulletin 36 (4): 149–151. ISSN 1052-8091. Bibcode: 2009MPBu...36..149G. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36..149G. Retrieved 15 December 2016.
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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 15 December 2016.
9. ↑ 9.0 9.1 "1807 Slovakia (1971 QA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1807. Retrieved 15 December 2016.
10. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. https://archive.org/details/dictionaryminorp2008schm.

## 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
* 1807 Slovakia at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1807 Slovakia at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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