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Asteroid Near-Earth

2021 BS1

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(2021 BS1)

Where is it now

Distance from Sun
0.675 AU
True anomaly
230.63°
Distance from Earth
1.624 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 2021 BS1 — 0.675 AU from the Sun 2021 BS1
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2021 BS1 is 1.624 AU from Earth today (13.5 light-minutes).

In the sky

Right ascension
13h 56m 29s
Declination
-17° 24′ 45″
Constellation
Virgo
Distance from Earth
1.62 AU
Elongation from the Sun
11.36° — too close to the Sun to observe

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
0.598 AU
Eccentricity
0.3376
Inclination
31.73°
Orbital period
169.1 days
Perihelion
0.396 AU
Aphelion
0.8 AU
Longitude of ascending node
27.67°
Argument of periapsis
332.67°
Epoch · J2000
2461200.5
Orbit class · IEO
Atira (interior-Earth object)
Earth MOID · 90.6 LD
0.2328 AU
Tisserand (Jupiter)
9.238

Orbit quality

Orbit very well determined (uncertainty code 2).

Observations used
46
Data arc
4.28 years
First observed
16 January 2021
Last observed
29 April 2025
Residual RMS
0.54 ″
Solution · Otto Matic
29 April 2025

Visual & observation

Absolute magnitude (H)
18.63

Discovery & classification

Atira Near-Earth Object

Close approaches 131 on record

When (UTC) Body Distance Lunar distances Relative speed
2040-08-23 12:26:00 Venus 0.1347 AU 52.4 LD 21.8 km/s
2040-10-18 15:36:00 Mercury 0.0754 AU 29.3 LD 28.3 km/s
2040-10-18 15:36:00 Merc 0.0754 AU 29.3 LD 28.3 km/s
2042-06-28 18:59:00 Venus 0.1037 AU 40.4 LD 20.7 km/s
2044-05-02 21:14:00 Venus 0.0765 AU 29.8 LD 19.8 km/s
2046-03-07 19:18:00 Venus 0.0557 AU 21.7 LD 19.1 km/s
2046-10-26 17:20:00 Mercury 0.069 AU 26.9 LD 25 km/s
2046-10-26 17:20:00 Merc 0.069 AU 26.9 LD 25 km/s
2048-01-10 13:54:00 Venus 0.0461 AU 17.9 LD 18.6 km/s
2049-11-14 04:52:00 Venus 0.0505 AU 19.7 LD 18.1 km/s

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

Sources