| Minorplanet: | yes |
| Background: |
|
| 21436 Chaoyichi | |
| Discoverer: | LINEAR |
| Discovery Site: | Lincoln Lab ETS |
| Discovered: | 31 March 1998 |
| Mpc Name: | (21436) Chaoyichi |
| Mp Category: | main-beltbackground |
| Epoch: | 13 January 2016 (JD 2457400.5) |
| Observation Arc: | 9565 days (26.19 yr) |
| Uncertainty: | 0 |
| Aphelion: | 2.3725454abbr=onNaNabbr=on |
| Perihelion: | 2.000887AU |
| Semimajor: | 2.186716AU |
| Eccentricity: | 0.0849810 |
| Period: | 3.23 yr (1181.1 d) |
| Inclination: | 3.736916° |
| Asc Node: | 320.37494° |
| Mean Anomaly: | 226.1171° |
| Mean Motion: | / day |
| Arg Peri: | 178.30874° |
| Satellites: | 1 |
| Rotation: | 2.87 h |
| Abs Magnitude: | 15.4 |
21436 Chaoyichi (provisional designation ) is a background asteroid and binary system from the inner region of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 31 March 1998, by astronomers of the Lincoln Near-Earth Asteroid Research at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, United States.