| Minorplanet: | yes |
| 1374 Isora | |
| Background: |
|
| Discovered: | 21 October 1935 |
| Mpc Name: | (1374) Isora |
| Alt Names: | 1935 UA |
| Named After: | Constructed female name |
| Epoch: | 16 February 2017 (JD 2457800.5) |
| Uncertainty: | 0 |
| Observation Arc: | 81.05 yr (29,604 days) |
| Perihelion: | 1.6230 AU |
| Semimajor: | 2.2502 AU |
| Eccentricity: | 0.2788 |
| Period: | 3.38 yr (1,233 days) |
| Mean Motion: | / day |
| Inclination: | 5.2943° |
| Asc Node: | 302.56° |
| Arg Peri: | 60.988° |
| Moid: | 0.6290 AU |
| Dimensions: | 5.48 km |
| Rotation: | h h |
| Albedo: | 0.20 |
| Abs Magnitude: | 13.0013.3 |
1374 Isora, provisional designation, 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. Isoras 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 . 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 .
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 .