Siding Spring
P/2006 HR30 (Siding Spring)
Where is it now
- Distance from Sun
- 7.066 AU
- True anomaly
- 216.23°
- 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
- 18h 43m 48s
- Declination
- -37° 14′ 58″
- Constellation
- Corona Australis
- Distance from Earth
- 6.77 AU
- Elongation from the Sun
- 102.98° — 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
- 7.818 AU
- Eccentricity
- 0.8431
- Inclination
- 31.88°
- Orbital period
- 21.86 years
- Perihelion
- 1.226 AU
- Aphelion
- 14.409 AU
- Longitude of ascending node
- 309.95°
- Argument of periapsis
- 117.41°
- Epoch · J2000
- 2454065.5
- Orbit class · HTC
- Halley-type comet
- Earth MOID · 176.2 LD
- 0.4527 AU
- Tisserand (Jupiter)
- 1.785
Orbit quality
Orbit very well determined (uncertainty code 0).
- Observations used
- 3,073
- Data arc
- 21.02 years
- First observed
- 6 July 2005
- Last observed
- 14 July 2026
- Residual RMS
- 0.43 ″
- Solution · Otto Matic
- 7 August 2026
Physical properties
- Rotation period
- 2.95 days
Visual & observation
- Absolute magnitude (H)
- 13.9
- Total magnitude M₁ · K₁ 4.5
- 13.9
Discovery & classification
Also known as 2006 HR30
Sources
- orbital elements: JPL SBDB