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Comet

Skiff

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C/2001 S1 (Skiff)

Skiff is a comet in the Comet orbit class. Its orbit takes it from 3.75 AU to 103.18 AU from the Sun; one orbit takes 390.9 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
40.426 AU
True anomaly
152°
Distance from Earth
40.971 AU
As of
24 October 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.

Sun Earth — 0.994 AU from the Sun Earth Skiff — 40.426 AU from the Sun Skiff
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Skiff is 40.971 AU from Earth today (5.7 light-hours).

In the sky

Right ascension
17h 13m 38s
Declination
+16° 08′ 39″
Constellation
Hercules
Distance from Earth
40.98 AU
Elongation from the Sun
55.82° — near the Sun — look low at dusk or dawn

Favours the northern hemisphere; low or below the horizon from far south.

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.

How do I find my coordinates?

Google Maps on a computer

  1. Right-click the spot where you'll be observing.
  2. The first line of the menu is the coordinates, e.g. 51.50722, -0.12758 — click it and they're copied.
  3. Paste them above.

Google Maps on a phone

  1. Press and hold the spot to drop a pin.
  2. The coordinates appear in the search bar (or on the pin's card) — tap to copy, then paste above.

A full Google Maps link works too, but the short maps.app.goo.gl share links don't carry coordinates — copy the numbers instead. We round to about a kilometre; that's all the sky calculation needs.

Know your what3words address? Paste it, e.g. ///filled.count.soap. This is optional — the three words are sent to what3words to convert them, and we don't store the address or the result.

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
53.464 AU
Eccentricity
0.9299
Inclination
139.13°
Orbital period
390.9 years
Perihelion
3.749 AU
Aphelion
103.179 AU
Longitude of ascending node
330.12°
Argument of periapsis
285.17°
Epoch · J2000
2452187.5
Orbit class · COM
Comet
Earth MOID · 1,179.9 LD
3.0319 AU
Tisserand (Jupiter)
-1.686

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
39
Data arc
85 days
First observed
22 August 2001
Last observed
15 November 2001
Residual RMS
0.79 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
6.9
Total magnitude M₁ · K₁ 15.3
6.9

Discovery & classification

Also known as 2001 S1

Named

Sources