Kowalski
C/2011 S2 (Kowalski)
Where is it now
- Distance from Sun
- 25.04 AU
- True anomaly
- 168.83°
- 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
- 19h 13m 09s
- Declination
- -22° 03′ 29″
- Constellation
- Sagittarius
- Distance from Earth
- 24.66 AU
- Elongation from the Sun
- 111.33° — 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
- 16.306 AU
- Eccentricity
- 0.9316
- Inclination
- 17.57°
- Orbital period
- 65.85 years
- Perihelion
- 1.115 AU
- Aphelion
- 31.498 AU
- Longitude of ascending node
- 288.07°
- Argument of periapsis
- 192.19°
- Epoch · J2000
- 2455857.5
- Orbit class · HTC
- Halley-type comet
- Earth MOID · 53.6 LD
- 0.1378 AU
- Tisserand (Jupiter)
- 1.546
Orbit quality
Orbit reasonably well determined (uncertainty code 4).
- Observations used
- 343
- Data arc
- 180 days
- First observed
- 30 September 2011
- Last observed
- 28 March 2012
- Residual RMS
- 0.67 ″
- Solution · Otto Matic
- 15 April 2021
Visual & observation
- Absolute magnitude (H)
- 15.6
- Total magnitude M₁ · K₁ 4.5
- 15.6
Discovery & classification
Also known as 2011 S2
Sources
- orbital elements: JPL SBDB