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Comet

Tsuchinshan

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C/2017 E2 (Tsuchinshan)

Tsuchinshan is a comet in the Halley-type comet orbit class. Its orbit takes it from 2.35 AU to 40.78 AU from the Sun; one orbit takes 100.1 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
21.093 AU
True anomaly
152.34°
Distance from Earth
21.608 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 Tsuchinshan — 21.093 AU from the Sun Tsuchinshan
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Tsuchinshan is 21.608 AU from Earth today (3.0 light-hours).

In the sky

Right ascension
11h 18m 36s
Declination
-62° 12′ 50″
Constellation
Carina
Distance from Earth
21.61 AU
Elongation from the Sun
57.68° — near the Sun — look low at dusk or dawn

Favours the southern hemisphere; low or below the horizon from far north.

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
21.566 AU
Eccentricity
0.8909
Inclination
79.17°
Orbital period
100.1 years
Perihelion
2.353 AU
Aphelion
40.778 AU
Longitude of ascending node
11.56°
Argument of periapsis
89.46°
Epoch · J2000
2457834.5
Orbit class · HTC
Halley-type comet
Earth MOID · 823.3 LD
2.1156 AU
Tisserand (Jupiter)
0.589

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
149
Data arc
89 days
First observed
1 March 2017
Last observed
29 May 2017
Residual RMS
0.39 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
14.5
Total magnitude M₁ · K₁ 4.5
14.5

Discovery & classification

Also known as 2017 E2

Named

Sources