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Asteroid Near-Earth

528807

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528807 (2009 BL71)

Where is it now

Distance from Sun
0.719 AU
True anomaly
37.8°
Distance from Earth
0.661 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 528807 — 0.719 AU from the Sun 528807
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 528807 is 0.661 AU from Earth today (5.5 light-minutes).

In the sky

Right ascension
16h 55m 44s
Declination
-25° 37′ 38″
Constellation
Ophiuchus
Distance from Earth
0.66 AU
Elongation from the Sun
46.27° — 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
0.937 AU
Eccentricity
0.2658
Inclination
5.55°
Orbital period
331.1 days
Perihelion
0.688 AU
Aphelion
1.186 AU
Longitude of ascending node
17.45°
Argument of periapsis
292.46°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 4.0 LD
0.0102 AU
Tisserand (Jupiter)
6.369

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
124
Data arc
10.17 years
First observed
30 January 2009
Last observed
4 April 2019
Residual RMS
0.47 ″
Solution · Otto Matic
1 March 2023

Visual & observation

Absolute magnitude (H)
22.07

Discovery & classification

Discovered by
CSS
Discovery date
30 January 2009
Discovery site
Catalina

Also known as 2009 BL71

Aten Near-Earth Object

Close approaches 179 on record

Flyby geometry
Ecliptic flyby of 528807 at 2026-12-09 19:41 UTC Top-down view of the ecliptic, Earth at the centre, for the 2026-12-09 19:41 UTC close approach of 528807. Catalogue miss distance 146.0 LD · 5.61 × 10⁷ km. The curve is the geocentric path from 2026-12-06 to 2026-12-12, 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. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 146.0 LD · 5.61 × 10⁷ km 2026-12-09 19:41 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2026-12-09 19:41 UTC close approach of 528807. Catalogue miss distance 146.0 LD · 5.61 × 10⁷ km. The curve is the geocentric path from 2026-12-06 to 2026-12-12, 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. 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
2026-12-09 19:41:00 Earth 0.3752 AU 146.0 LD 19.9 km/s
2027-10-17 02:49:00 Earth 0.2137 AU 83.2 LD 6.2 km/s
2027-12-28 06:07:00 Earth 0.1932 AU 75.2 LD 6.1 km/s
2028-07-15 00:54:00 Earth 0.3322 AU 129.3 LD 10.8 km/s
2029-04-01 06:07:00 Earth 0.0188 AU 7.3 LD 9.1 km/s
2030-06-07 05:32:00 Venus 0.0124 AU 4.8 LD 7.2 km/s
2032-02-09 20:15:00 Venus 0.1279 AU 49.8 LD 12.4 km/s
2036-11-26 13:09:00 Earth 0.0828 AU 32.2 LD 9.9 km/s
2037-08-18 02:39:00 Earth 0.3282 AU 127.7 LD 10.9 km/s
2038-03-04 11:48:00 Earth 0.1758 AU 68.4 LD 6.3 km/s

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

Sources