SWAN
P/2005 T4 (SWAN)
Where is it now
- Distance from Sun
- 15.326 AU
- True anomaly
- 189.27°
- 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
- 10h 15m 59s
- Declination
- -04° 43′ 08″
- Constellation
- Sextans
- Distance from Earth
- 16.25 AU
- Elongation from the Sun
- 22.86° — near the Sun — look low at dusk or dawn
Visible from both hemispheres.
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
- 9.324 AU
- Eccentricity
- 0.9304
- Inclination
- 160.04°
- Orbital period
- 28.47 years
- Perihelion
- 0.649 AU
- Aphelion
- 17.999 AU
- Longitude of ascending node
- 25.42°
- Argument of periapsis
- 41.44°
- Epoch · J2000
- 2453667.5
- Orbit class · HTC
- Halley-type comet
- Earth MOID · 61.2 LD
- 0.1573 AU
- Tisserand (Jupiter)
- -0.365
Orbit quality
Orbit very uncertain — the object may be effectively lost (uncertainty code 8).
- Observations used
- 31
- Data arc
- 17 days
- First observed
- 14 October 2005
- Last observed
- 31 October 2005
- Residual RMS
- 0.67 ″
- Solution · Otto Matic
- 15 April 2021
Visual & observation
- Absolute magnitude (H)
- 15.4
- Total magnitude M₁ · K₁ 10
- 15.4
Discovery & classification
Also known as 2005 T4
Sources
- orbital elements: JPL SBDB