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Asteroid Near-Earth

85770

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85770 (1998 UP1)

85770 is an asteroid in the Aten orbit class. Its orbit takes it from 0.65 AU to 1.34 AU from the Sun; one orbit takes 364 days. Discovered 18 October 1998 by LINEAR. Orbit from the JPL solution of 20 October 2025.

Where is it now

Distance from Sun
1.283 AU
True anomaly
155.91°
Distance from Earth
0.434 AU
As of
2 November 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 — 0.992 AU from the Sun Earth 85770 — 1.283 AU from the Sun 85770
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 85770 is 0.434 AU from Earth today (3.6 light-minutes).

In the sky

Right ascension
01h 28m 53s
Declination
+71° 03′ 19″
Constellation
Cassiopeia
Distance from Earth
0.44 AU
Elongation from the Sun
123.26° — well clear of the Sun

Favours the northern hemisphere; low or below the horizon from far south.

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
0.998 AU
Eccentricity
0.3452
Inclination
33.18°
Orbital period
364 days
Perihelion
0.653 AU
Aphelion
1.342 AU
Longitude of ascending node
18.31°
Argument of periapsis
234.24°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 32.4 LD
0.0833 AU
Tisserand (Jupiter)
5.903

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
468
Data arc
35.02 years
First observed
12 October 1990
Last observed
19 October 2025
Residual RMS
0.38 ″
Solution · Otto Matic
20 October 2025

Visual & observation

Absolute magnitude (H)
20.72

Discovery & classification

Discovered by
LINEAR
Discovery date
18 October 1998
Discovery site
Socorro

Also known as 1998 UP1

Aten Near-Earth Object

Close approaches 64 on record

When (UTC) Body Distance Lunar distances Relative speed
2044-04-25 19:05:00 Venus 0.0247 AU 9.6 LD 21.9 km/s
2065-03-30 02:05:00 Venus 0.1109 AU 43.2 LD 20.3 km/s
2073-03-23 12:58:00 Venus 0.0605 AU 23.5 LD 23.3 km/s
2094-02-22 18:43:00 Venus 0.0279 AU 10.9 LD 22.3 km/s
2115-01-24 19:14:00 Venus 0.0256 AU 10.0 LD 22.2 km/s
2135-12-27 15:45:00 Venus 0.058 AU 22.6 LD 21 km/s
2143-12-21 17:31:00 Venus 0.0963 AU 37.5 LD 24.3 km/s
2164-11-27 17:30:00 Venus 0.1204 AU 46.9 LD 20.1 km/s
2172-11-23 03:16:00 Venus 0.0265 AU 10.3 LD 21.8 km/s
2180-11-19 02:38:00 Venus 0.0857 AU 33.3 LD 24 km/s

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

Sources