2023 RO16 is an asteroid in the Apollo orbit class. Its orbit takes it from 1.01 AU to 1.05 AU from the Sun; one orbit takes 382.9 days. Orbit from the JPL solution of 19 September 2023.
Where is it now
- Distance from Sun
- 1.05 AU
- True anomaly
- 144.92°
- Distance from Earth
- 0.925 AU
- As of
- 3 November 2026
Two-body Kepler propagation — accurate to ~0.1% for major planets over decades, less so for highly-perturbed bodies. Use JPL Horizons for high precision.
In the sky
- Right ascension
- 19h 20m 39s
- Declination
- -22° 09′ 45″
- Constellation
- Sagittarius
- Distance from Earth
- 0.93 AU
- Elongation from the Sun
- 66.33° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
See how high it is right now, whether it is up after civil twilight, and when it rises and sets where you are.
Your location stays in your browser and is sent only for this calculation. Using a what3words address is optional; if you do, the three words go to what3words to be converted and we don't record them. Set a location first, then you can save an email alert for this object. See our privacy policy.
Two-body approximation, good to about a degree for the planets — enough to find the constellation and know whether it is up.
Orbital elements
- Semi-major axis
- 1.032 AU
- Eccentricity
- 0.0218
- Inclination
- 3.17°
- Orbital period
- 382.9 days
- Perihelion
- 1.01 AU
- Aphelion
- 1.055 AU
- Longitude of ascending node
- 168.18°
- Argument of periapsis
- 34.48°
- Epoch · J2000
- 2461200.5
- Orbit class · APO
- Apollo
- Earth MOID · 7.3 LD
- 0.0187 AU
- Tisserand (Jupiter)
- 5.931
Orbit quality
Orbit very well determined (uncertainty code 2).
- Observations used
- 19
- Data arc
- 184 days
- First observed
- 17 March 2023
- Last observed
- 17 September 2023
- Residual RMS
- 0.9 ″
- Solution · Otto Matic
- 19 September 2023
Visual & observation
- Absolute magnitude (H)
- 27.86
Discovery & classification
Close approaches 45 on record
Top-down view of the ecliptic, Earth at the centre, for the 2044-03-29 03:26 UTC close approach of 2023 RO16. Catalogue miss distance 91.9 LD · 3.53 × 10⁷ km. The curve is the geocentric path from 2044-03-26 to 2044-04-01, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2044-03-29 03:26:00 | Earth | 0.2362 AU | 91.9 LD | 7.6 km/s |
| 2045-02-16 11:56:00 | Earth | 0.0568 AU | 22.1 LD | 1.7 km/s |
| 2045-07-19 16:05:00 | Earth | 0.07 AU | 27.2 LD | 2.5 km/s |
| 2046-07-14 04:30:00 | Earth | 0.3817 AU | 148.6 LD | 11.6 km/s |
| 2063-03-30 07:58:00 | Earth | 0.4517 AU | 175.8 LD | 13.8 km/s |
| 2064-03-27 08:03:00 | Earth | 0.1187 AU | 46.2 LD | 4.4 km/s |
| 2064-10-12 19:27:00 | Earth | 0.0726 AU | 28.3 LD | 1.9 km/s |
| 2065-07-06 23:12:00 | Earth | 0.1974 AU | 76.8 LD | 6.2 km/s |
| 2083-03-27 01:03:00 | Earth | 0.4799 AU | 186.8 LD | 14.7 km/s |
| 2084-03-26 01:26:00 | Earth | 0.1568 AU | 61.0 LD | 5.4 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- visual properties: JPL SBDB (lookup)
- orbital elements: JPL SBDB