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Comet

LINEAR

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C/2001 A1 (LINEAR)

LINEAR is a comet in the Comet orbit class. Its orbit takes it from 2.41 AU to 528.62 AU from the Sun; one orbit takes 4,326.5 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
46.238 AU
True anomaly
154.77°
Distance from Earth
46.713 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 LINEAR — 46.238 AU from the Sun LINEAR
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. LINEAR is 46.713 AU from Earth today (6.5 light-hours).

In the sky

Right ascension
12h 40m 22s
Declination
-71° 46′ 11″
Constellation
Musca
Distance from Earth
46.72 AU
Elongation from the Sun
60.72° — well clear of the Sun

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
265.511 AU
Eccentricity
0.9909
Inclination
59.94°
Orbital period
4,326.5 years
Perihelion
2.406 AU
Aphelion
528.616 AU
Longitude of ascending node
339.59°
Argument of periapsis
107.89°
Epoch · J2000
2451944.5
Orbit class · COM
Comet
Earth MOID · 725.9 LD
1.8653 AU
Tisserand (Jupiter)
0.981

Orbit quality

Observations used
126
Data arc
93 days
First observed
7 January 2001
Last observed
10 April 2001
Residual RMS
0.76 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
12.8
Total magnitude M₁ · K₁ 6.8
12.8

Discovery & classification

Also known as 2001 A1

Named

Sources