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Asteroid Near-Earth

2024 RC42

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(2024 RC42)

Where is it now

Distance from Sun
1.093 AU
True anomaly
175.97°
Distance from Earth
1.275 AU
As of
19 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 — 0.996 AU from the Sun Earth 2024 RC42 — 1.093 AU from the Sun 2024 RC42
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2024 RC42 is 1.275 AU from Earth today (10.6 light-minutes).

In the sky

Right ascension
17h 26m 28s
Declination
-23° 51′ 31″
Constellation
Ophiuchus
Distance from Earth
1.27 AU
Elongation from the Sun
55.94° — near the Sun — look low at dusk or dawn

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
0.823 AU
Eccentricity
0.3294
Inclination
1.2°
Orbital period
272.9 days
Perihelion
0.552 AU
Aphelion
1.095 AU
Longitude of ascending node
350.09°
Argument of periapsis
145.25°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 0.0 LD
0 AU
Tisserand (Jupiter)
7.071

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
24
First observed
12 September 2024
Last observed
12 September 2024
Residual RMS
0.39 ″
Solution · Otto Matic
16 September 2024

Visual & observation

Absolute magnitude (H)
32.38

Discovery & classification

Aten Near-Earth Object

Close approaches 91 on record

Flyby geometry
Ecliptic flyby of 2024 RC42 at 2027-04-10 20:52 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-04-10 20:52 UTC close approach of 2024 RC42. Catalogue miss distance 139.2 LD · 5.35 × 10⁷ km. The curve is the geocentric path from 2027-04-07 to 2027-04-13, 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 139.2 LD · 5.35 × 10⁷ km 2027-04-10 20:52 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-04-10 20:52 UTC close approach of 2024 RC42. Catalogue miss distance 139.2 LD · 5.35 × 10⁷ km. The curve is the geocentric path from 2027-04-07 to 2027-04-13, 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
2027-04-10 20:52:00 Earth 0.3576 AU 139.2 LD 9.9 km/s
2027-09-15 19:21:00 Earth 0.0639 AU 24.9 LD 9.4 km/s
2029-05-14 14:18:00 Venus 0.1257 AU 48.9 LD 8.6 km/s
2030-03-30 04:54:00 Earth 0.383 AU 149.0 LD 11.7 km/s
2030-09-14 12:24:00 Earth 0.1438 AU 55.9 LD 12 km/s
2033-03-18 23:40:00 Earth 0.403 AU 156.8 LD 13.3 km/s
2033-09-11 16:29:00 Earth 0.229 AU 89.1 LD 14.7 km/s
2036-03-07 22:24:00 Earth 0.4182 AU 162.7 LD 14.5 km/s
2036-09-08 01:14:00 Earth 0.3193 AU 124.3 LD 17.6 km/s
2036-12-29 18:54:00 Venus 0.1085 AU 42.2 LD 16.3 km/s

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

Sources