Skip to content
Public Universe
Comet

Boattini

Add to an observing list or journal →

C/2009 W2 (Boattini)

Boattini is a comet in the Comet orbit class. Its orbit takes it from 6.91 AU to 30,958.68 AU from the Sun; one orbit takes 1,926,558.5 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
30.961 AU
True anomaly
123.65°
Distance from Earth
30.758 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 Boattini — 30.961 AU from the Sun Boattini
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Boattini is 30.758 AU from Earth today (4.3 light-hours).

In the sky

Right ascension
21h 22m 38s
Declination
-30° 12′ 57″
Constellation
Microscopium
Distance from Earth
30.77 AU
Elongation from the Sun
100.2° — 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
15,482.794 AU
Eccentricity
0.9996
Inclination
164.49°
Orbital period
1,926,558.5 years
Perihelion
6.907 AU
Aphelion
30,958.681 AU
Longitude of ascending node
199.58°
Argument of periapsis
121.33°
Epoch · J2000
2455177.5
Orbit class · COM
Comet
Earth MOID · 2,316.4 LD
5.9522 AU
Tisserand (Jupiter)
-3.139

Orbit quality

Observations used
93
Data arc
686 days
First observed
22 December 2008
Last observed
8 November 2010
Residual RMS
0.59 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
6.9
Total magnitude M₁ · K₁ 10
6.9

Discovery & classification

Also known as 2009 W2

Named

Sources