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Centaur

2017 DH177

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(2017 DH177)

Where is it now

Distance from Sun
4.678 AU
True anomaly
357.99°
Distance from Earth
3.811 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 2017 DH177 — 4.678 AU from the Sun 2017 DH177
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 DH177 is 3.811 AU from Earth today (31.7 light-minutes).

In the sky

Right ascension
22h 57m 17s
Declination
+00° 38′ 21″
Constellation
Pisces
Distance from Earth
3.82 AU
Elongation from the Sun
146.04° — 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
6.319 AU
Eccentricity
0.2597
Inclination
10.04°
Orbital period
15.88 years
Perihelion
4.678 AU
Aphelion
7.959 AU
Longitude of ascending node
205.6°
Argument of periapsis
148.5°
Epoch · J2000
2461200.5
Orbit class · CEN
Centaur
Earth MOID · 1,431.1 LD
3.6773 AU
Tisserand (Jupiter)
2.919

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
92
Data arc
17.07 years
First observed
1 July 2008
Last observed
28 July 2025
Residual RMS
0.23 ″
Solution · Otto Matic
11 March 2026

Visual & observation

Absolute magnitude (H)
15.41

Discovery & classification

Centaur

Close approaches 10 on record

When (UTC) Body Distance Lunar distances Relative speed
2053-11-20 08:44:00 Juptr 1.8595 AU 723.7 LD 3.2 km/s
2059-09-01 06:40:00 Juptr 1.1423 AU 444.5 LD 5.9 km/s
2069-06-05 10:29:00 Satrn 1.8955 AU 737.7 LD 3.9 km/s
2095-05-12 15:06:00 Juptr 1.2622 AU 491.2 LD 6.5 km/s
2154-06-24 19:29:00 Juptr 0.9638 AU 375.1 LD 5.9 km/s

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

Sources