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Asteroid Near-Earth

2025 RB3

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(2025 RB3)

Where is it now

Distance from Sun
1.05 AU
True anomaly
211.91°
Distance from Earth
0.394 AU
As of
21 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 — 0.995 AU from the Sun Earth 2025 RB3 — 1.05 AU from the Sun 2025 RB3
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2025 RB3 is 0.394 AU from Earth today (3.3 light-minutes).

In the sky

Right ascension
08h 35m 53s
Declination
+33° 57′ 41″
Constellation
Lynx
Distance from Earth
0.39 AU
Elongation from the Sun
86.75° — 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
0.935 AU
Eccentricity
0.1536
Inclination
5.49°
Orbital period
330.3 days
Perihelion
0.791 AU
Aphelion
1.079 AU
Longitude of ascending node
321.5°
Argument of periapsis
236.3°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 3.3 LD
0.0084 AU
Tisserand (Jupiter)
6.399

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
16
Data arc
14 days
First observed
14 September 2025
Last observed
28 September 2025
Residual RMS
0.3 ″
Solution · Otto Matic
29 September 2025

Visual & observation

Absolute magnitude (H)
25.21

Discovery & classification

Aten Near-Earth Object

Close approaches 19 on record

Flyby geometry
Ecliptic flyby of 2025 RB3 at 2035-12-20 02:46 UTC Top-down view of the ecliptic, Earth at the centre, for the 2035-12-20 02:46 UTC close approach of 2025 RB3. Catalogue miss distance 38.4 LD · 1.48 × 10⁷ km. The curve is the geocentric path from 2035-12-17 to 2035-12-23, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. At closest approach the object is north of the ecliptic. The path is approximate: a two-body Kepler propagation of the catalogue orbital elements, not a numerical integration. The Moon’s position is approximate. The inset is a heliocentric view and is approximate. approximate Sun 38.4 LD · 1.48 × 10⁷ km 2035-12-20 02:46 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2035-12-20 02:46 UTC close approach of 2025 RB3. Catalogue miss distance 38.4 LD · 1.48 × 10⁷ km. The curve is the geocentric path from 2035-12-17 to 2035-12-23, with a mark at UTC midnights and an arrow for the direction of motion. The circle is the Moon’s mean orbit; the Moon is plotted at closest approach. A ray shows the Sun’s direction. The labelled distance is the full separation. The drawn radius is the part that lies in the ecliptic plane. At closest approach the object is north of the ecliptic. The path is approximate: a two-body Kepler propagation of the catalogue orbital elements, not a numerical integration. The Moon’s position is approximate. The inset is a heliocentric view and is approximate.

When (UTC) Body Distance Lunar distances Relative speed
2028-11-08 14:26:00 Venus 0.135 AU 52.5 LD 4.6 km/s
2035-12-20 02:46:00 Earth 0.0987 AU 38.4 LD 6.6 km/s
2044-04-10 08:31:00 Venus 0.116 AU 45.1 LD 3.8 km/s
2045-02-08 18:44:00 Earth 0.1537 AU 59.8 LD 5 km/s
2053-08-19 00:49:00 Earth 0.0723 AU 28.1 LD 7 km/s
2059-10-10 20:59:00 Venus 0.1309 AU 51.0 LD 3.2 km/s
2063-06-03 23:25:00 Earth 0.2 AU 77.8 LD 4.8 km/s
2064-01-09 07:07:00 Earth 0.1007 AU 39.2 LD 3.9 km/s
2072-08-18 01:58:00 Earth 0.0324 AU 12.6 LD 5.9 km/s
2075-02-20 14:28:00 Venus 0.1278 AU 49.7 LD 2.6 km/s

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

Sources