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Asteroid Near-Earth Potentially hazardous

363027

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363027 (1998 ST27)

Where is it now

Distance from Sun
1.249 AU
True anomaly
175.12°
Distance from Earth
0.957 AU
As of
17 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 363027 — 1.249 AU from the Sun 363027
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 363027 is 0.957 AU from Earth today (8.0 light-minutes).

In the sky

Right ascension
18h 52m 48s
Declination
-04° 39′ 14″
Constellation
Scutum
Distance from Earth
0.96 AU
Elongation from the Sun
79.19° — well clear of the Sun

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
0.82 AU
Eccentricity
0.5298
Inclination
21.05°
Orbital period
271.1 days
Perihelion
0.385 AU
Aphelion
1.254 AU
Longitude of ascending node
197.51°
Argument of periapsis
322.44°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 3.7 LD
0.0096 AU
Tisserand (Jupiter)
6.975

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
1,054
Data arc
27.95 years
First observed
24 September 1998
Last observed
5 September 2026
Residual RMS
0.33 ″
Solution · Otto Matic
5 September 2026

Physical properties

Mean radius
0.29 km
Rotation period
3 hours

Visual & observation

Geometric albedo
0.059
Absolute magnitude (H)
19.58

Discovery & classification

Discovered by
LINEAR
Discovery date
24 September 1998
Discovery site
Socorro

Also known as 1998 ST27

Aten Near-Earth Object Potentially Hazardous Asteroid

Close approaches 126 on record

Flyby geometry
Ecliptic flyby of 363027 at 2027-10-09 10:15 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-10-09 10:15 UTC close approach of 363027. Catalogue miss distance 58.6 LD · 2.25 × 10⁷ km. The curve is the geocentric path from 2027-10-06 to 2027-10-12, 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 58.6 LD · 2.25 × 10⁷ km 2027-10-09 10:15 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-10-09 10:15 UTC close approach of 363027. Catalogue miss distance 58.6 LD · 2.25 × 10⁷ km. The curve is the geocentric path from 2027-10-06 to 2027-10-12, 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
2027-10-09 10:15:00 Earth 0.1506 AU 58.6 LD 21.2 km/s
2029-04-17 18:47:00 Venus 0.1491 AU 58.0 LD 18.9 km/s
2034-08-22 07:59:00 Mercury 0.0195 AU 7.6 LD 26.4 km/s
2034-08-22 07:59:00 Merc 0.0195 AU 7.6 LD 26.4 km/s
2043-07-19 09:30:00 Mercury 0.0162 AU 6.3 LD 25.3 km/s
2043-07-19 09:30:00 Merc 0.0162 AU 6.3 LD 25.3 km/s
2047-02-16 15:38:00 Venus 0.1284 AU 50.0 LD 25.6 km/s
2047-10-12 15:54:00 Earth 0.0752 AU 29.3 LD 15.5 km/s
2050-10-10 22:10:00 Earth 0.092 AU 35.8 LD 19.6 km/s
2050-10-29 06:45:00 Venus 0.1262 AU 49.1 LD 20 km/s

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

Sources