| Discovery | |
|---|---|
| Discovered by | E. Delporte |
| Discovery site | Uccle Obs. |
| Discovery date | 21 October 1935 |
| Designations | |
Named after | Constructed female name ("Rosi" spelled backwards) |
| 1935 UA | |
| Mars-crosser | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.05 yr (29,604 days) |
| Aphelion | 2.8775 AU |
| Perihelion | 1.6230 AU |
| 2.2502 AU | |
| Eccentricity | 0.2788 |
| 3.38 yr (1,233 days) | |
| 44.987° | |
| 0° 17m 31.2s / day | |
| Inclination | 5.2943° |
| 302.56° | |
| 60.988° | |
| Earth MOID | 0.6290 AU |
| Physical characteristics | |
| Dimensions | 5.48 km (derived) |
| 8±2 h 36.699±0.001 h | |
| 0.20 (assumed) | |
| SMASS = Sq · S | |
| 13.00 · 13.3 · 13.32±0.32 · 13.67±0.15 | |
1374 Isora, provisional designation 1935 UA, is a stony asteroid and eccentric Mars-crosser from the innermost regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 21 October 1935, by Belgian astronomer Eugène Delporte at Uccle Observatory in Belgium.
In the SMASS taxonomy, Isora is classified as a Sq-type, an intermediary between the abundant S and rather rare Q-type asteroids. It orbits the Sun at a distance of 1.6–2.9 AU once every 3 years and 5 months (1,233 days). Its orbit has an eccentricity of 0.28 and an inclination of 5° with respect to the ecliptic. Isora's observation arc begins with its official discovery observation at Uccle, as no precoveries were taken and no prior identifications were made.
In January 2014, a rotational light-curve of Isora was obtained by American astronomer Robert D. Stephens at the Center for Solar System Studies (CS3) in California. Light-curve analysis gave a longer than average rotation period of 36.699 hours with a brightness variation of 0.12 magnitude (U=2+). However, a second period solution of 18.35 hours is also possible. The result supersedes photometric observations taken by Wiesław Z. Wiśniewski in 1989, which rendered a fragmentary light-curve with a period of 8 hours (U=1).
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 5.48 kilometers using an absolute magnitude of 13.67.
Isora is the backwards spelled feminine name "Rosi" with an appended "a". Naming was proposed by Gustav Stracke (1887–1943) – astronomer at the German Astronomisches Rechen-Institut, and after whom the minor planet 1019 Strackea is named – and first cited by Paul Herget in his The Names of the Minor Planets in 1955 (H 125).
