| Minorplanet: | yes |
| 1340 Yvette | |
| Background: |
|
| Discovered: | 27 December 1934 |
| Mpc Name: | (1340) Yvette |
| Alt Names: | 1934 YA1930 DO 1942 GW |
| Named After: | Yvette |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 82.84 yr (30,256 days) |
| Perihelion: | 2.7754 AU |
| Semimajor: | 3.1842 AU |
| Eccentricity: | 0.1284 |
| Period: | 5.68 yr (2,075 days) |
| Mean Motion: | / day |
| Inclination: | 0.4161° |
| Asc Node: | 345.69° |
| Arg Peri: | 224.26° |
| Dimensions: | km km km km km km km |
| Albedo: | |
| Abs Magnitude: | 11.10 |
1340 Yvette, provisional designation, is a carbonaceous Themistian asteroid from the outer regions of the asteroid belt, approximately 29 kilometers in diameter. It was discovered on 27 December 1934, by astronomer Louis Boyer at the Algiers Observatory, who named it after his niece, Yvette.
Yvette is a Themistian asteroid that belongs to the Themis family, a very large family of nearly 5,000 member asteroids, named after 24 Themis. It orbits the Sun in the outer main belt at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,075 days; semi-major axis of 3.18 AU). Its orbit has an eccentricity of 0.13 and an inclination of 0° with respect to the ecliptic.
The asteroid was first identified as at Heidelberg Observatory in February 1930. The body's observation arc begins with its official discovery observation at Algiers in 1934.
Yvette has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey, in line with the overall spectral type of the Themis family.
Published in 2004, a first rotational lightcurve of Yvette was obtained from photometric observations by Brazilian and Argentinian astronomers. Lightcurve analysis gave a relatively short rotation period of 3.525 hours with a brightness amplitude of 0.16 magnitude .
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Yvette measures between 25.87 and 33.061 kilometers in diameter and its surface has an albedo between 0.0587 and 0.0958.
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0958 and a diameter of 25.87 kilometers based on an absolute magnitude of 11.1.
This minor planet was named by the discoverer in honor of his niece, Yvette. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 .