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Comet Near-Earth

STEREO

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414P/STEREO

Where is it now

Distance from Sun
3.936 AU
True anomaly
159.02°
Distance from Earth
4.403 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 STEREO — 3.936 AU from the Sun STEREO
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. STEREO is 4.403 AU from Earth today (36.6 light-minutes).

In the sky

Right ascension
16h 55m 09s
Declination
-19° 08′ 11″
Constellation
Ophiuchus
Distance from Earth
4.41 AU
Elongation from the Sun
55.66° — near the Sun — look low at dusk or dawn

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
2.794 AU
Eccentricity
0.8117
Inclination
23.39°
Orbital period
4.67 years
Perihelion
0.526 AU
Aphelion
5.061 AU
Longitude of ascending node
257.79°
Argument of periapsis
210.71°
Epoch · J2000
2459905.5
Orbit class · JFc
Jupiter-family comet (P < 20 y)
Earth MOID · 124.5 LD
0.32 AU
Tisserand (Jupiter)
2.648

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
300
Data arc
9.37 years
First observed
11 May 2016
Last observed
23 September 2025
Residual RMS
0.64 ″
Solution · Shantanu Naidu
7 January 2026

Visual & observation

Absolute magnitude (H)
20.5
Total magnitude M₁ · K₁ 39.5
20.5

Discovery & classification

Also known as 414P · 414P/2016 J3 · 414P/2021 A3

Near-Earth Object Named

Close approaches 18 on record

When (UTC) Body Distance Lunar distances Relative speed
2031-12-06 13:01:00 Juptr 0.8785 AU 341.9 LD 9.9 km/s
2053-12-08 19:12:00 Venus 0.1265 AU 49.2 LD 27.3 km/s
2055-08-23 13:58:00 Juptr 0.8345 AU 324.8 LD 9.2 km/s
2079-05-14 14:39:00 Juptr 0.8335 AU 324.4 LD 9 km/s
2103-02-03 02:15:00 Juptr 0.8617 AU 335.3 LD 9.5 km/s
2126-11-19 05:03:00 Juptr 1.1167 AU 434.6 LD 11 km/s
2150-11-04 02:23:00 Juptr 1.9211 AU 747.6 LD 14.3 km/s
2162-12-05 16:40:00 Juptr 1.5441 AU 600.9 LD 10.5 km/s
2173-11-09 05:39:00 Venus 0.1451 AU 56.5 LD 30.9 km/s
2186-09-01 12:30:00 Juptr 1.1923 AU 464.0 LD 8.5 km/s

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

Sources