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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:56 
Transit: 13:05 
Sunset: 21:13
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Dwarf Planets and Asteroids » 

Asteroid 1I/2017 U1 (Oumuamua)

Above the horizon.  Rise: 21:23 | Tran: 5:47 | Set: 14:08
Alt: 62.75°   Az: 163.57°   Direction: South-South-East

Asteroid 1I/2017 U1 (Oumuamua) is in the constellation of Pegasus, at a distance of 7,110,816,022.0 kilometers from Earth. The current Right Ascension is 00h 01m 19s and the Declination is +24° 57’ 50” (apparent coordinates). The magnitude of asteroid 1I/2017 U1 (Oumuamua) is 39.03.

Finder Charts

The sky charts below show, at different resolutions, the position of asteroid 1I/2017 U1 (Oumuamua) in the sky. Click on each chart to access the interactive star map tool.

Star map showing the position of asteroid 1I/2017 U1 (Oumuamua) in the constellation of Pegasus on F, d Y. Field of view: 50x30 degrees. View interactive star map.
Star map showing the position of asteroid 1I/2017 U1 (Oumuamua) in the constellation of Pegasus on F, d Y. Field of view: 15x9 degrees. View in interactive star map.

The following map uses photographic imagery from the Digitized Sky Survey (DSS) to realistically visualize the precise position of asteroid 1I/2017 U1 (Oumuamua) against the stars in the background. The horizontal size of the map measures 60 arcminutes. Click on the image to access a more detailed full-screen view.

1I/2017 U1 (Oumuamua)
RA: 00h 00m 00s
Dec: +24° 49’ 18”
Simplified high-resolution deep sky chart showing the current position of asteroid 1I/2017 U1 (Oumuamua). Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

00h 01m 19s
+24° 57’ 50”
23h 27m 09s
23h 28m 28s

J2000

00h 00m 00s
+24° 49’ 18”

Additional Information

Pegasus
39.03

Rise and Set Times

The following table lists today's rise, transit and set times of asteroid 1I/2017 U1 (Oumuamua) from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 65.0°
Max altitude: 63.5°
Azimuth: 295.0°

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Distance from Earth

The distance of asteroid 1I/2017 U1 (Oumuamua) from Earth is currently 7,110,816,022.0 kilometers, equivalent to 47.5328692095 Astronomical Units. Light takes 6h 35m 19.129s to travel from asteroid 1I/2017 U1 (Oumuamua) and arrive to us.

7,110,816,022.0
47.5328692095
6h 35m 19.129s

The following graph shows the distance of asteroid 1I/2017 U1 (Oumuamua) from Earth as a function of time. In the chart the distance is measured in Astronomical Units and the data is sampled with an interval of 1 day.

Chart of the distance of asteroid 1I/2017 U1 (Oumuamua) from Earth in Astronomical Units (au)
Note: The values in this chart may not be entirely accurate around the time of closest approach for objects passing very close to Earth at high speed (e.g., Near-Earth Objects).

The value of the distance of 1I/2017 U1 (Oumuamua) from Earth is also available as a real time updated value in the live position tracker.

Closest Approach to Earth

In the period between January 1, 2013 and December 30, 2100, the closest approach of asteroid 1I/2017 U1 (Oumuamua) to Earth happened on Sunday 15 October 2017 at a distance of 0.161991 Astronomical Units, or 24,233,513 kilometers:

Sunday 15 October 2017
24,233,513
0.161991

Note: the values for the closest approach are computed with a sampling interval of 1 day.

Light Curve

The following chart shows the light curve of asteroid 1I/2017 U1 (Oumuamua), i.e., its apparent magnitude as a function of time. The curve is calculated using the latest ephemerides provided by JPL Horizons. The magnitude data is sampled with the interval of 2 days. Because of this sampling, inaccuracies may occur for objects that have large variations of brightness over a few days. For comets, large discrepancies can arise between the calculated brightness and the observations due to their highly dynamic, and not always precisely predictable, behavior.

Chart of the magnitude of asteroid 1I/2017 U1 (Oumuamua) as a function of time

Orbital Elements

The following table lists the orbital elements of asteroid 1I/2017 U1 (Oumuamua) at epoch November, 22 2017 00:00 UTC (JD: 2458080.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 1.20113380
Orbit inclination i 122.74170628°
Perihelion distance q 0.25591158 AU
38,283,828 km
Aphelion distance Q n.a.
Semi-major axis a n.a.
Orbital period period n.a.
Date of perihelion transit Tp September 9, 2017
2,458,006.0073 JD
Argument of perihelion peri 241.81053603049°
Longitude of the ascending node node 24.596909555232°
Mean anomaly M 51.157619793825°
Mean motion n 0.68674695°/day

Orbit Visualization

The following chart is a 3D animated visualization of the orbit of asteroid 1I/2017 U1 (Oumuamua) relative to the other major objects in the Solar System. You can access more advanced features using our 3D Solar System Viewer.

15 Days Ephemeris

The following table lists the ephemerides of asteroid 1I/2017 U1 (Oumuamua) computed for the past and next 7 days, with a 24 hours interval. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
Jul 03 2025 00h 01m 29s +24° 55’ 04” 39.03 Pegasus
Jul 04 2025 00h 01m 27s +24° 55’ 29” 39.03 Pegasus
Jul 05 2025 00h 01m 26s +24° 55’ 53” 39.03 Pegasus
Jul 06 2025 00h 01m 25s +24° 56’ 17” 39.03 Pegasus
Jul 07 2025 00h 01m 23s +24° 56’ 40” 39.03 Pegasus
Jul 08 2025 00h 01m 22s +24° 57’ 02” 39.03 Pegasus
Jul 09 2025 00h 01m 20s +24° 57’ 24” 39.03 Pegasus
Jul 10 2025 00h 01m 19s +24° 57’ 46” 39.03 Pegasus
Jul 11 2025 00h 01m 17s +24° 58’ 07” 39.03 Pegasus
Jul 12 2025 00h 01m 15s +24° 58’ 27” 39.03 Pegasus
Jul 13 2025 00h 01m 13s +24° 58’ 47” 39.03 Pegasus
Jul 14 2025 00h 01m 11s +24° 59’ 06” 39.03 Pegasus
Jul 15 2025 00h 01m 09s +24° 59’ 24” 39.03 Pegasus
Jul 16 2025 00h 01m 07s +24° 59’ 42” 39.03 Pegasus

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