| Minorplanet: | yes |
| 1835 Gajdariya | |
| Background: |
|
| Discovered: | 30 July 1970 |
| Mpc Name: | (1835) Gajdariya |
| Alt Names: | 1970 OE1958 BH 1961 TJ 1963 DB 1973 EN |
| Named After: | Arkady Gaidar |
| Epoch: | 4 September 2017 (JD 2458000.5) |
| Uncertainty: | 0 |
| Observation Arc: | 59.28 yr (21,653 days) |
| Perihelion: | 2.5811 AU |
| Semimajor: | 2.8326 AU |
| Eccentricity: | 0.0888 |
| Period: | 4.77 yr (1,741 days) |
| Mean Motion: | / day |
| Inclination: | 0.9857° |
| Asc Node: | 296.26° |
| Arg Peri: | 80.748° |
| Dimensions: | 12.40 km km km |
| Rotation: | h h |
| Albedo: | 0.24 |
| Abs Magnitude: | 11.511.7 |
1835 Gajdariya, provisional designation, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 12.5 kilometers in diameter.
It was discovered on 30 July 1970, by Russian astronomer Tamara Smirnova at Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. It was named after Russian writer Arkady Gaidar.
The S-type asteroid is a member of the Koronis family, which is named after 158 Koronis and consists of about 300 known bodies with nearly ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.6–3.1 AU once every 4 years and 9 months (1,741 days). Its orbit has an eccentricity of 0.09 and an inclination of 1° with respect to the ecliptic. Its spectra is that of an S-type asteroid with a geometric albedo of about 0.24. It has a rotation period of 6.33 hours.
It was named in honor of Soviet–Russian writer and children's author Arkady Gaidar (1904–1941), who joined the partisans and became a machine gunner during the Nazi invasion of the Soviet Union. Gaidar was killed in combat in October 1941. The official was published by the Minor Planet Center on 1 June 1975 .