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Comet

Metcalf

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C/1919 Q2 (Metcalf)

Metcalf is a comet in the Comet orbit class. Its orbit takes it from 1.12 AU to 10,072.48 AU from the Sun; one orbit takes 357,470.3 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
125.181 AU
True anomaly
169.24°
Distance from Earth
125.121 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 Metcalf — 125.181 AU from the Sun Metcalf
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Metcalf is 125.121 AU from Earth today (17.3 light-hours).

In the sky

Right ascension
08h 01m 51s
Declination
+16° 47′ 43″
Constellation
Cancer
Distance from Earth
125.11 AU
Elongation from the Sun
93.76° — well clear of the Sun

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
5,036.797 AU
Eccentricity
0.9998
Inclination
46.38°
Orbital period
357,470.3 years
Perihelion
1.115 AU
Aphelion
10,072.48 AU
Longitude of ascending node
122.1°
Argument of periapsis
185.76°
Epoch · J2000
2422219.5
Orbit class · COM
Comet
Earth MOID · 39.8 LD
0.1023 AU
Tisserand (Jupiter)
0.904

Orbit quality

Observations used
18
Data arc
83 days
First observed
26 August 1919
Last observed
17 November 1919
Residual RMS
1.27 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
5.1
Total magnitude M₁ · K₁ 11.5
5.1

Discovery & classification

Also known as 1919 Q2

Named

Sources