LONEOS
C/2001 OG108 (LONEOS)
Where is it now
- Distance from Sun
- 25.604 AU
- True anomaly
- 180.19°
- As of
- 17 September 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
- 02h 16m 56s
- Declination
- -58° 06′ 08″
- Constellation
- Horologium
- Distance from Earth
- 25.15 AU
- Elongation from the Sun
- 116.14° — well clear of the Sun
Favours the southern hemisphere; low or below the horizon from far north.
From your location
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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
- 13.3 AU
- Eccentricity
- 0.9253
- Inclination
- 80.25°
- Orbital period
- 48.51 years
- Perihelion
- 0.994 AU
- Aphelion
- 25.606 AU
- Longitude of ascending node
- 10.56°
- Argument of periapsis
- 116.42°
- Epoch · J2000
- 2452248.5
- Orbit class · HTC
- Halley-type comet
- Earth MOID · 117.1 LD
- 0.3008 AU
- Tisserand (Jupiter)
- 0.597
Orbit quality
Orbit very well determined (uncertainty code 2).
- Observations used
- 882
- Data arc
- 340 days
- First observed
- 28 July 2001
- Last observed
- 3 July 2002
- Residual RMS
- 0.62 ″
- Solution · Otto Matic
- 15 April 2021
Physical properties
- Mean radius
- 6.80 km
- Rotation period
- 2.38 days
Visual & observation
- Geometric albedo
- 0.054
- Absolute magnitude (H)
- 13.3
- Total magnitude M₁ · K₁ 11.5
- 13.3
Discovery & classification
Also known as 2001 OG108
Close approaches 1 on record
| When (UTC) | Body | Distance | Lunar distances | Relative speed |
|---|---|---|---|---|
| 2147-03-23 11:20:00 | Earth | 0.417 AU | 162.3 LD | 40.3 km/s |
Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.
Sources
- orbital elements: JPL SBDB