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Asteroid Near-Earth

2015 SD

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(2015 SD)

Where is it now

Distance from Sun
1.06 AU
True anomaly
157.15°
Distance from Earth
1.045 AU
As of
19 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 2015 SD — 1.06 AU from the Sun 2015 SD
Seen from above the ecliptic, north up, to scale. Grid: Earth's orbit in blue. 2015 SD is 1.045 AU from Earth today (8.7 light-minutes).

In the sky

Right ascension
17h 57m 00s
Declination
-13° 02′ 38″
Constellation
Serpens
Distance from Earth
1.05 AU
Elongation from the Sun
62.53° — 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
0.861 AU
Eccentricity
0.2657
Inclination
20.08°
Orbital period
292.1 days
Perihelion
0.633 AU
Aphelion
1.09 AU
Longitude of ascending node
176.24°
Argument of periapsis
350.91°
Epoch · J2000
2461200.5
Orbit class · ATE
Aten
Earth MOID · 30.9 LD
0.0794 AU
Tisserand (Jupiter)
6.777

Orbit quality

Orbit very well determined (uncertainty code 0).

Observations used
102
Data arc
12.04 years
First observed
6 September 2011
Last observed
20 September 2023
Residual RMS
0.44 ″
Solution · Otto Matic
20 September 2023

Visual & observation

Absolute magnitude (H)
24.3

Discovery & classification

Aten Near-Earth Object

Close approaches 179 on record

Flyby geometry
Ecliptic flyby of 2015 SD at 2027-05-20 10:19 UTC Top-down view of the ecliptic, Earth at the centre, for the 2027-05-20 10:19 UTC close approach of 2015 SD. Catalogue miss distance 148.5 LD · 5.71 × 10⁷ km. The curve is the geocentric path from 2027-05-17 to 2027-05-23, 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 north of the ecliptic. The path is a geocentric ecliptic ephemeris from JPL Horizons. The inset is a heliocentric view and is approximate. Sun 148.5 LD · 5.71 × 10⁷ km 2027-05-20 10:19 UTC Earth Moon Heliocentric, approximate

Top-down view of the ecliptic, Earth at the centre, for the 2027-05-20 10:19 UTC close approach of 2015 SD. Catalogue miss distance 148.5 LD · 5.71 × 10⁷ km. The curve is the geocentric path from 2027-05-17 to 2027-05-23, 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 north 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
2027-05-20 10:19:00 Earth 0.3815 AU 148.5 LD 11.7 km/s
2027-09-22 06:10:00 Earth 0.0802 AU 31.2 LD 10.8 km/s
2028-11-20 11:51:00 Venus 0.1341 AU 52.2 LD 15.6 km/s
2031-05-17 20:01:00 Earth 0.3813 AU 148.4 LD 12.1 km/s
2031-09-23 04:46:00 Earth 0.0813 AU 31.6 LD 10.8 km/s
2035-05-14 20:23:00 Earth 0.3807 AU 148.2 LD 12.6 km/s
2035-09-24 09:27:00 Earth 0.0848 AU 33.0 LD 10.9 km/s
2039-05-11 09:38:00 Earth 0.3799 AU 147.8 LD 13.1 km/s
2039-09-25 17:15:00 Earth 0.0913 AU 35.5 LD 11 km/s
2043-05-07 09:24:00 Earth 0.3786 AU 147.4 LD 13.7 km/s

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

Sources