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1807 Slovakia

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Dec 16, 2021

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]

1807 Slovakia
Discovery[1]
Discovered by M. Antal
Discovery site Skalnaté Pleso Obs.
Discovery date 20 August 1971
Designations
(1807) Slovakia
Named after
Slovakia(country)[2]
1971 QA · 1928 UE
1948 UC · 1951 JA
1951 QK · 1954 NA
1960 GB · 1971 TM1
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)
Aphelion 2.6229 AU
Perihelion 1.8289 AU
2.2259 AU
Eccentricity 0.1784
3.32 yr (1,213 days)
283.80°
0° 17m 48.48s / day
Inclination 3.4919°
236.35°
140.53°
Physical characteristics
Dimensions 9.135±0.092 km[4]
9.146±0.059 km[5]
9.40 km (calculated)[3]
24 h (dated)[6]
308.0±0.3 h[7]
308.6 h[3]
0.20 (assumed)[3]
0.3058±0.0411[5]
0.309±0.073[4]
SMASS = S[1] · S[3]
12.1[5] · 12.5[1][3] · 12.61[7] · 13.06±0.93[8]

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    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]

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

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

    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]

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    . . . 1807 Slovakia . . .