| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 29 January 1933 |
| Designations | |
| (1259) Ógyalla | |
Named after | Hurbanovo Observatory (551) (formerly O'Gyalla Observatory)[2] |
| 1933 BT · 1928 DJ1 1928 FO · 1929 MA 1935 QE1 · 1949 YN 1956 JF | |
| main-belt · Themis[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.36 yr (32,640 days) |
| Aphelion | 3.5000AU |
| Perihelion | 2.7064 AU |
| 3.1032 AU | |
| Eccentricity | 0.1279 |
| 5.47yr (1,997 days) | |
| 94.460° | |
| 0° 10m 49.08s / day | |
| Inclination | 2.3810° |
| 75.001° | |
| 149.89° | |
| Physical characteristics | |
| Dimensions | 26.59±7.87 km[5] 31.32±1.13 km[6] 33.13±1.6 km[7] 33.31 km(derived)[3] 36.111±0.510 km[8] 39.484±0.440 km[9] |
| 12h(dated)[10] 17.2669±0.1183 h(S)[11] 17.3038±0.0573 h(R)[11] 17.334±0.004 h[12] | |
| 0.0451±0.0103[9] 0.0641±0.007[7] 0.066±0.019[8] 0.072±0.006[6] 0.0916(derived)[3] 0.10±0.05[5] | |
| S[3] | |
| 10.349±0.002(R)[11] · 10.6[1][3] · 10.64[5] · 10.678±0.003(S)[11] · 11.0[6][7][9] | |
1259 Ógyalla, provisional designation1933 BT, is a Themistianasteroid from the outer region of theasteroid belt, approximately 32 kilometers in diameter. It was discovered on 29 January 1933, by German astronomerKarl Reinmuth atHeidelberg Observatory in southwest Germany.[13] The asteroid was named for the Hurbanovo Observatory (551).[2]
Ógyalla is a member of theThemis family, the9th largest main-beltasteroid family of nearly 5,000 asteroids with nearly coplanarecliptical orbits.[4] It orbits the Sun in theouter main-belt at a distance of 2.7–3.5 AU once every 5 years and 6 months (1,997 days). Its orbit has aneccentricity of 0.13 and aninclination of 2° with respect to the ecliptic.[1] It was first identified as1928 DJ1 and1928 FO at the discovering observatory in 1928, extending the asteroid'sobservation arc by 5 years prior to its official discovery observation.[13]
A rotationallightcurve ofÓgyalla was obtained by theSpanish Photometric Asteroid Analysis Group (OBAS) in June 2016. Light curve analysis gave a well-definedrotation period of 17.334 hours with a brightness variation of 0.41magnitude (U=3).[12] In September 2012, photometric observations at thePalomar Transient Factory gave a period of 17.2669 and 17.3038 hours with an amplitude of 0.27 and 0.25 in the R- and S-band, respectively (U=2/2).[11]
The first lightcurve was already obtained in 1974, by Swedish astronomerClaes-Ingvar Lagerkvist atUppsala Observatory from photographic photometry, but it was only fragmentary and gave a tentative period of 12 hours (U=1).[10]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Ógyalla measures between 26.59 and 36.11 kilometers in diameter, and its surface has analbedo between 0.064 and 0.10 (without preliminary results).[5][6][7][8] TheCollaborative Asteroid Lightcurve Link (CALL) derives an albedo of 0.0916 and a diameter of 33.31 kilometers based on anabsolute magnitude of 10.6. CALL also classifies it as a stonyS-type asteroid (as it does with all Themistians).[3]
Thisminor planet was named for the Hurbanovo Observatory (IAU code:551; formerly known as O'Gyalla Observatory), a seismological, meteorological and astronomical observatory in the former Hungarian city ofÓgyalla. Since 1948, the city belongs to Slovakia and is now known asHurbanovo.[2] The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 116).[2]
