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Asteroid Near-Earth

5587

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5587 (1990 SB)

Where is it now

Distance from Sun
2.529 AU
True anomaly
232.37°
Distance from Earth
3.275 AU
As of
11 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.

Orbit of Mercury Orbit of Venus Orbit of Mars Sun Earth — 0.998 AU from the Sun Earth 5587 — 2.529 AU from the Sun 5587
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 5587 is 3.275 AU from Earth today (27.2 light-minutes).

In the sky

Right ascension
10h 48m 02s
Declination
-01° 53′ 08″
Constellation
Sextans
Distance from Earth
3.27 AU
Elongation from the Sun
35.78° — 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
2.4 AU
Eccentricity
0.5443
Inclination
18.06°
Orbital period
3.72 years
Perihelion
1.094 AU
Aphelion
3.706 AU
Longitude of ascending node
189.08°
Argument of periapsis
87.86°
Epoch · J2000
2461200.5
Orbit class · AMO
Amor
Earth MOID · 121.3 LD
0.3116 AU
Tisserand (Jupiter)
3.252

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
5,086
Data arc
72.13 years
First observed
7 December 1953
Last observed
25 January 2026
Residual RMS
0.43 ″
Solution · Otto Matic
26 January 2026

Physical properties

Mean radius
1.79 km
Rotation period
5.05 hours

Visual & observation

Geometric albedo
0.32
Absolute magnitude (H)
13.89
Spectral type (SMASS)
Sq

Discovery & classification

Discovered by
Holt, H. E., Brown, J. A.
Discovery date
16 September 1990
Discovery site
Palomar

Also known as 1990 SB · 1990 UV12

Amor Near-Earth Object

Close approaches 7 on record

When (UTC) Body Distance Lunar distances Relative speed
2084-08-24 18:18:00 Juptr 1.9679 AU 765.8 LD 3.1 km/s
2134-08-03 02:00:00 Mars 0.0145 AU 5.6 LD 13.9 km/s
2143-12-09 08:04:00 Juptr 1.9714 AU 767.2 LD 3 km/s

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

Sources