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Comet

Bressi

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C/2015 H1 (Bressi)

Bressi is a comet in the Halley-type comet orbit class. Its orbit takes it from 1.93 AU to 63.15 AU from the Sun; one orbit takes 185.6 years. Orbit from the JPL solution of 15 April 2021.

Where is it now

Distance from Sun
24.283 AU
True anomaly
154.06°
Distance from Earth
24.76 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 Bressi — 24.283 AU from the Sun Bressi
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. Bressi is 24.76 AU from Earth today (3.4 light-hours).

In the sky

Right ascension
10h 16m 18s
Declination
+13° 30′ 53″
Constellation
Leo
Distance from Earth
24.75 AU
Elongation from the Sun
60.77° — 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
32.537 AU
Eccentricity
0.9408
Inclination
140.66°
Orbital period
185.6 years
Perihelion
1.926 AU
Aphelion
63.147 AU
Longitude of ascending node
325.8°
Argument of periapsis
21.76°
Epoch · J2000
2457169.5
Orbit class · HTC
Halley-type comet
Earth MOID · 367.7 LD
0.9449 AU
Tisserand (Jupiter)
-1.151

Orbit quality

Orbit reasonably well determined (uncertainty code 5).

Observations used
210
Data arc
98 days
First observed
20 April 2015
Last observed
27 July 2015
Residual RMS
0.62 ″
Solution · Otto Matic
15 April 2021

Visual & observation

Absolute magnitude (H)
4.2
Total magnitude M₁ · K₁ 40.8
4.2

Discovery & classification

Also known as 2015 H1

Named

Sources