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Asteroid Near-Earth

2023 HB4

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(2023 HB4)

Where is it now

Distance from Sun
0.991 AU
True anomaly
159.9°
Distance from Earth
1.941 AU
As of
15 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 — 0.997 AU from the Sun Earth 2023 HB4 — 0.991 AU from the Sun 2023 HB4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2023 HB4 is 1.941 AU from Earth today (16.1 light-minutes).

In the sky

Right ascension
12h 37m 01s
Declination
-05° 37′ 23″
Constellation
Virgo
Distance from Earth
1.94 AU
Elongation from the Sun
12.67° — too close to the Sun to observe

Visible from both hemispheres.

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
0.714 AU
Eccentricity
0.4614
Inclination
5.33°
Orbital period
220.3 days
Perihelion
0.384 AU
Aphelion
1.043 AU
Longitude of ascending node
211.42°
Argument of periapsis
165.97°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.7 LD
0.0044 AU
Tisserand (Jupiter)
7.944

Orbit quality

Orbit poorly determined (uncertainty code 6).

Observations used
71
Data arc
24 hours
First observed
23 April 2023
Last observed
24 April 2023
Residual RMS
0.45 ″
Solution · Otto Matic
26 April 2023

Visual & observation

Absolute magnitude (H)
26.84

Discovery & classification

Aten Near-Earth Object

Close approaches 113 on record

Flyby geometry
Ecliptic flyby of 2023 HB4 at 2029-03-28 08:53 UTC Top-down view of the ecliptic, Earth at the centre, for the 2029-03-28 08:53 UTC close approach of 2023 HB4. Catalogue miss distance 19.4 LD · 7.46 × 10⁶ km. The curve is the geocentric path from 2029-03-25 to 2029-03-31, 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 south of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 19.4 LD · 7.46 × 10⁶ km 2029-03-28 08:53 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2029-03-28 08:53 UTC close approach of 2023 HB4. Catalogue miss distance 19.4 LD · 7.46 × 10⁶ km. The curve is the geocentric path from 2029-03-25 to 2029-03-31, 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 south of the ecliptic. 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
2029-03-28 08:53:00 Earth 0.0499 AU 19.4 LD 8.8 km/s
2032-03-17 18:37:00 Earth 0.0581 AU 22.6 LD 10.2 km/s
2035-03-15 15:15:00 Earth 0.1192 AU 46.4 LD 12.8 km/s
2035-07-06 00:03:00 Earth 0.4449 AU 173.1 LD 7.9 km/s
2038-03-16 14:14:00 Earth 0.204 AU 79.4 LD 16 km/s
2038-07-21 08:07:00 Earth 0.4922 AU 191.5 LD 12.8 km/s
2038-08-19 05:44:00 Merc 0.0793 AU 30.9 LD 12.2 km/s
2038-08-19 05:44:00 Mercury 0.0793 AU 30.9 LD 12.2 km/s
2039-11-02 01:04:00 Mercury 0.0626 AU 24.4 LD 13 km/s
2039-11-02 01:04:00 Merc 0.0626 AU 24.4 LD 13 km/s

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

Sources