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Asteroid Near-Earth

2025 RB

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(2025 RB)

Where is it now

Distance from Sun
0.874 AU
True anomaly
295.84°
Distance from Earth
0.628 AU
As of
22 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 RB — 0.874 AU from the Sun 2025 RB
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2025 RB is 0.628 AU from Earth today (5.2 light-minutes).

In the sky

Right ascension
09h 43m 41s
Declination
-31° 23′ 06″
Constellation
Antlia
Distance from Earth
0.63 AU
Elongation from the Sun
60.08° — well clear of the Sun

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
0.95 AU
Eccentricity
0.1469
Inclination
29.42°
Orbital period
338.2 days
Perihelion
0.81 AU
Aphelion
1.09 AU
Longitude of ascending node
159.11°
Argument of periapsis
322.91°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 16.6 LD
0.0426 AU
Tisserand (Jupiter)
6.213

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
20
Data arc
6 days
First observed
27 August 2025
Last observed
2 September 2025
Residual RMS
0.42 ″
Solution · Otto Matic
1 September 2025

Visual & observation

Absolute magnitude (H)
26.57

Discovery & classification

Aten Near-Earth Object

Close approaches 29 on record

Flyby geometry
Ecliptic flyby of 2025 RB at 2050-09-02 18:29 UTC Top-down view of the ecliptic, Earth at the centre, for the 2050-09-02 18:29 UTC close approach of 2025 RB. Catalogue miss distance 17.1 LD · 6.56 × 10⁶ km. The curve is the geocentric path from 2050-08-30 to 2050-09-05, 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. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 17.1 LD · 6.56 × 10⁶ km 2050-09-02 18:29 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2050-09-02 18:29 UTC close approach of 2025 RB. Catalogue miss distance 17.1 LD · 6.56 × 10⁶ km. The curve is the geocentric path from 2050-08-30 to 2050-09-05, 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. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate.

JPL Horizons

When (UTC) Body Distance Lunar distances Relative speed
2030-09-23 07:24:00 Venus 0.1385 AU 53.9 LD 17.5 km/s
2032-07-28 04:47:00 Venus 0.1229 AU 47.8 LD 17.6 km/s
2034-06-02 04:10:00 Venus 0.1196 AU 46.5 LD 17.8 km/s
2036-04-06 05:17:00 Venus 0.1289 AU 50.2 LD 18.1 km/s
2038-02-09 07:37:00 Venus 0.1497 AU 58.2 LD 18.6 km/s
2050-09-02 18:29:00 Earth 0.0439 AU 17.1 LD 14.8 km/s
2111-04-28 00:37:00 Venus 0.1445 AU 56.2 LD 17.5 km/s
2118-09-13 23:21:00 Venus 0.137 AU 53.3 LD 18.3 km/s
2163-09-04 04:52:00 Earth 0.0512 AU 19.9 LD 14.9 km/s
2188-02-25 02:43:00 Earth 0.1757 AU 68.4 LD 17 km/s

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

Sources