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Centaur

2017 OK193

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(2017 OK193)

Where is it now

Distance from Sun
8.143 AU
True anomaly
191.37°
Distance from Earth
9.075 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 OK193 — 8.143 AU from the Sun 2017 OK193
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2017 OK193 is 9.075 AU from Earth today (1.3 light-hours).

In the sky

Right ascension
13h 46m 16s
Declination
-24° 45′ 58″
Constellation
Hydra
Distance from Earth
9.08 AU
Elongation from the Sun
19.33° — too close to the Sun to observe

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
6.152 AU
Eccentricity
0.3367
Inclination
15.49°
Orbital period
15.26 years
Perihelion
4.081 AU
Aphelion
8.224 AU
Longitude of ascending node
327.74°
Argument of periapsis
57.01°
Epoch · J2000
2461200.5
Orbit class · CEN
Centaur
Earth MOID · 1,212.4 LD
3.1152 AU
Tisserand (Jupiter)
2.819

Orbit quality

Orbit reasonably well determined (uncertainty code 4).

Observations used
17
Data arc
65 days
First observed
21 July 2017
Last observed
24 September 2017
Residual RMS
0.47 ″
Solution · Otto Matic
9 July 2024

Visual & observation

Absolute magnitude (H)
16.09

Discovery & classification

Centaur

Close approaches 4 on record

When (UTC) Body Distance Lunar distances Relative speed
2097-07-31 20:33:00 Juptr 1.0776 AU 419.4 LD 4.2 km/s
2139-03-08 05:52:00 Juptr 1.5118 AU 588.3 LD 8.2 km/s

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

Sources