Skip to content
Public Universe
Comet

ASAS

Add to an observing list or journal →

C/2004 R2 (ASAS)

ASAS is a comet in the Comet orbit class. Its orbit takes it from 0.11 AU to 3,238,164.39 AU from the Sun; one orbit takes 2,060,210,375.3 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
44.085 AU
True anomaly
174.2°
Distance from Earth
43.227 AU
As of
25 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 ASAS — 44.085 AU from the Sun ASAS
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. ASAS is 43.227 AU from Earth today (6.0 light-hours).

In the sky

Right ascension
00h 05m 11s
Declination
+01° 00′ 13″
Constellation
Pisces
Distance from Earth
43.24 AU
Elongation from the Sun
148.47° — well clear of the Sun

Visible from both hemispheres.

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
1,619,082.251 AU
Eccentricity
1
Inclination
63.17°
Orbital period
2,060,210,375.3 years
Perihelion
0.113 AU
Aphelion
3,238,164.388 AU
Longitude of ascending node
182.46°
Argument of periapsis
5.35°
Epoch · J2000
2453263.5
Orbit class · COM
Comet
Earth MOID · 201.0 LD
0.5164 AU
Tisserand (Jupiter)
0.188

Orbit quality

Observations used
66
Data arc
18 days
First observed
9 September 2004
Last observed
27 September 2004
Residual RMS
0.8 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
10
Total magnitude M₁ · K₁ 6
10

Discovery & classification

Also known as 2004 R2

Named

Sources