| Minorplanet: | yes |
| 1170 Siva | |
| Background: |
|
| Discovered: | 29 September 1930 |
| Mpc Name: | (1170) Siva |
| Alt Names: | 1930 SQ |
| Epoch: | 16 February 2017 (JD 2457800.5) |
| Uncertainty: | 0 |
| Observation Arc: | 85.19 yr (31,116 days) |
| Perihelion: | 1.6291 AU |
| Semimajor: | 2.3268 AU |
| Eccentricity: | 0.2998 |
| Period: | 3.55 yr (1,296 days) |
| Mean Motion: | / day |
| Inclination: | 22.184° |
| Asc Node: | 0.9218° |
| Arg Peri: | 59.391° |
| Moid: | 0.7263 AU |
| Mars Moid: | 0.3760 AU |
| Dimensions: | km km km |
| Rotation: | h h h |
| Albedo: | |
| Abs Magnitude: | 12.0012.1812.43 |
1170 Siva, provisional designation, is a stony Phocaea asteroid and large Mars-crosser from the innermost regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 29 September 1930, by Belgian astronomer Eugène Delporte at Uccle Observatory in Belgium, and later named after the Hindu deity Shiva.
Siva is a Mars-crossing asteroid, as it crosses the orbit of Mars at 1.666 AU. It is also a member of the Phocaea family . It orbits the Sun at a distance of 1.6–3.0 AU once every 3 years and 7 months (1,296 days). Its orbit has an eccentricity of 0.30 and an inclination of 22° with respect to the ecliptic. Siva was first observed at the Japanese Kwasan Observatory, 3 days prior to is discovery. The body's observation arc begins at Uccle, two weeks after its official discovery observation.
This minor planet is named after Shiva, a Hindu deity often depicted with a third eye on his forehead and with a snake around his neck. Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 .
In the Tholen taxonomy, Siva is a stony S-type asteroid.
Only fragmentary lightcurves of Siva have been obtained since 2001. They gave a rotation period between 3.5 and 5.22 hours with a small change in brightness of 0.04 to 0.1 magnitude . As of 2017, no secure period has been published.
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Siva measures between 7.68 and 12.13 kilometers in diameter, and its surface has an albedo between 0.128 and 0.40. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1751 and a diameter of 10.37 kilometers with an absolute magnitude of 12.43. Siva belongs to the brightest known Mars-crossers.