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Comet

Singer Brewster

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105P/Singer Brewster

Where is it now

Distance from Sun
4.086 AU
True anomaly
135.74°
Distance from Earth
3.09 AU
As of
11 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.

Orbit of Mercury Orbit of Venus Orbit of Mars Sun Earth — 0.998 AU from the Sun Earth Singer Brewster — 4.086 AU from the Sun Singer Brewster
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Singer Brewster is 3.09 AU from Earth today (25.7 light-minutes).

In the sky

Right ascension
00h 50m 08s
Declination
+04° 49′ 20″
Constellation
Pisces
Distance from Earth
3.09 AU
Elongation from the Sun
174.26° — near opposition — up most of the night

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
3.469 AU
Eccentricity
0.4091
Inclination
9.17°
Orbital period
6.46 years
Perihelion
2.05 AU
Aphelion
4.888 AU
Longitude of ascending node
192.41°
Argument of periapsis
46.61°
Epoch · J2000
2456550.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 409.4 LD
1.0519 AU
Tisserand (Jupiter)
2.971

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
898
Data arc
39.39 years
First observed
3 May 1986
Last observed
24 September 2025
Residual RMS
0.8 ″
Solution · Shantanu Naidu
6 October 2025

Physical properties

Mean radius
1.10 km

Visual & observation

Absolute magnitude (H)
13.7
Total magnitude M₁ · K₁ 10.3
13.7

Discovery & classification

Discovered by
Singer-Brewster, Stephen
Discovery date
3 May 1986
Discovery site
Palomar Mountain Observatory, California

Also known as 105P · 105P/1986 J1 · 105P/1992 G1 · 1986 XI · 1986d · 1992 XXVI · 1992e

Named

Close approaches 13 on record

When (UTC) Body Distance Lunar distances Relative speed
2048-05-29 22:21:00 Juptr 1.2265 AU 477.3 LD 6.5 km/s
2059-08-06 18:20:00 Juptr 0.4076 AU 158.6 LD 4.2 km/s
2059-08-06 18:20:00 Jupiter 0.4076 AU 158.6 LD 4.2 km/s
2071-06-19 09:51:00 Juptr 1.7957 AU 698.8 LD 9 km/s
2131-07-09 13:31:00 Juptr 1.5332 AU 596.7 LD 8.2 km/s
2143-02-10 05:13:00 Jupiter 0.4702 AU 183.0 LD 4 km/s
2143-02-10 05:13:00 Juptr 0.4702 AU 183.0 LD 4 km/s
2154-05-25 01:16:00 Juptr 0.913 AU 355.3 LD 5.7 km/s

Next ten from today. 1 lunar distance = 384,400 km. Source: JPL close-approach data.

Sources