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Asteroid Near-Earth

2023 HD4

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(2023 HD4)

Where is it now

Distance from Sun
0.507 AU
True anomaly
17.19°
Distance from Earth
0.982 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 2023 HD4 — 0.507 AU from the Sun 2023 HD4
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2023 HD4 is 0.982 AU from Earth today (8.2 light-minutes).

In the sky

Right ascension
11h 53m 51s
Declination
-04° 23′ 33″
Constellation
Virgo
Distance from Earth
0.99 AU
Elongation from the Sun
29.66° — near the Sun — look low at dusk or dawn

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
0.945 AU
Eccentricity
0.4713
Inclination
9.53°
Orbital period
335.4 days
Perihelion
0.499 AU
Aphelion
1.39 AU
Longitude of ascending node
212.17°
Argument of periapsis
233.69°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 1.7 LD
0.0044 AU
Tisserand (Jupiter)
6.249

Orbit quality

Orbit poorly determined (uncertainty code 7).

Observations used
64
Data arc
6 days
First observed
23 April 2023
Last observed
29 April 2023
Residual RMS
0.55 ″
Solution · Otto Matic
29 April 2023

Visual & observation

Absolute magnitude (H)
26.04

Discovery & classification

Aten Near-Earth Object

Close approaches 86 on record

Flyby geometry
Ecliptic flyby of 2023 HD4 at 2034-04-23 22:55 UTC Top-down view of the ecliptic, Earth at the centre, for the 2034-04-23 22:55 UTC close approach of 2023 HD4. Catalogue miss distance 35.7 LD · 1.37 × 10⁷ km. The curve is the geocentric path from 2034-04-20 to 2034-04-26, 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 35.7 LD · 1.37 × 10⁷ km 2034-04-23 22:55 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2034-04-23 22:55 UTC close approach of 2023 HD4. Catalogue miss distance 35.7 LD · 1.37 × 10⁷ km. The curve is the geocentric path from 2034-04-20 to 2034-04-26, 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
2034-04-23 22:55:00 Earth 0.0918 AU 35.7 LD 17 km/s
2035-02-19 20:34:00 Earth 0.3961 AU 154.1 LD 11.7 km/s
2035-05-16 11:08:00 Earth 0.3224 AU 125.5 LD 10.6 km/s
2035-12-24 13:51:00 Earth 0.4935 AU 192.1 LD 21 km/s
2036-06-29 05:03:00 Earth 0.3994 AU 155.4 LD 10.9 km/s
2036-11-03 05:54:00 Earth 0.4362 AU 169.8 LD 17.2 km/s
2037-08-19 13:44:00 Earth 0.1706 AU 66.4 LD 12.1 km/s
2038-07-29 12:27:00 Earth 0.4427 AU 172.3 LD 26.6 km/s
2045-04-28 10:38:00 Earth 0.2156 AU 83.9 LD 20.7 km/s
2046-05-02 18:48:00 Earth 0.2471 AU 96.2 LD 10.1 km/s

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

Sources