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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 4:58 
Transit: 13:05 
Sunset: 21:12
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Dwarf Planets and Asteroids » 

Asteroid 162173 Ryugu (1999 JU3)

Below the horizon.  Rise: 17:21 | Tran: 22:04 | Set: 2:51
Alt: -25.87°   Az: 279.34°   Direction: West

Asteroid 162173 Ryugu (1999 JU3) is in the constellation of Ophiuchus, at a distance of 73,436,922.0 kilometers from Earth. The current Right Ascension is 16h 28m 44s and the Declination is -14° 29’ 59” (apparent coordinates). The magnitude of asteroid 162173 Ryugu (1999 JU3) is 19.87.

Finder Charts

The sky charts below show, at different resolutions, the position of asteroid 162173 Ryugu (1999 JU3) in the sky. Click on each chart to access the interactive star map tool.

Star map showing the position of asteroid 162173 Ryugu (1999 JU3) in the constellation of Ophiuchus on F, d Y. Field of view: 50x30 degrees. View interactive star map.
Star map showing the position of asteroid 162173 Ryugu (1999 JU3) in the constellation of Ophiuchus 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 162173 Ryugu (1999 JU3) 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.

162173 Ryugu (1999 JU3)
RA: 16h 27m 18s
Dec: -14° 26’ 39”
Simplified high-resolution deep sky chart showing the current position of asteroid 162173 Ryugu (1999 JU3). Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

16h 28m 44s
-14° 29’ 59”
07h 33m 59s
00h 02m 43s

J2000

16h 27m 18s
-14° 26’ 39”

Additional Information

Ophiuchus
19.87

Rise and Set Times

The following table lists today's rise, transit and set times of asteroid 162173 Ryugu (1999 JU3) from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 104.5°
Max altitude: 24.1°
Azimuth: 255.5°

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 162173 Ryugu (1999 JU3) from Earth is currently 73,436,922.0 kilometers, equivalent to 0.4908955031 Astronomical Units. Light takes 4m 4.959s to travel from asteroid 162173 Ryugu (1999 JU3) and arrive to us.

73,436,922.0
0.4908955031
4m 4.959s

The following graph shows the distance of asteroid 162173 Ryugu (1999 JU3) 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 162173 Ryugu (1999 JU3) 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 162173 Ryugu (1999 JU3) 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 162173 Ryugu (1999 JU3) to Earth will happen on Sunday 6 December 2076 at a distance of 0.010460 Astronomical Units, or 1,564,794 kilometers:

Sunday 6 December 2076
1,564,794
0.010460

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 162173 Ryugu (1999 JU3), 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 162173 Ryugu (1999 JU3) as a function of time

Orbital Elements

The following table lists the orbital elements of asteroid 162173 Ryugu (1999 JU3) at epoch February, 24 2023 00:00 UTC (JD: 2460000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.19108984
Orbit inclination i 5.86617919°
Perihelion distance q 0.96337310 AU
144,118,565 km
Aphelion distance Q 1.41853074 AU
212,209,178 km
Semi-major axis a 1.19095192 AU
178,163,872 km
Orbital period period 1.2997 years
474.7225 days
Date of perihelion transit Tp August 12, 2023
2,460,168.8284 JD
Next perihelion transit November 29, 2024
2,460,643.5508 JD
Argument of perihelion peri 211.60686871766°
Longitude of the ascending node node 251.30134002236°
Mean anomaly M 232.35020871517°
Mean motion n 0.75833784°/day

Orbit Visualization

The following chart is a 3D animated visualization of the orbit of asteroid 162173 Ryugu (1999 JU3) 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 162173 Ryugu (1999 JU3) 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 05 2025 16h 33m 40s -15° 13’ 47” 19.54 Ophiuchus
Jul 06 2025 16h 32m 46s -15° 06’ 32” 19.59 Ophiuchus
Jul 07 2025 16h 31m 56s -14° 59’ 41” 19.64 Ophiuchus
Jul 08 2025 16h 31m 11s -14° 53’ 11” 19.68 Ophiuchus
Jul 09 2025 16h 30m 29s -14° 47’ 05” 19.73 Ophiuchus
Jul 10 2025 16h 29m 52s -14° 41’ 20” 19.77 Ophiuchus
Jul 11 2025 16h 29m 18s -14° 35’ 58” 19.82 Ophiuchus
Jul 12 2025 16h 28m 49s -14° 30’ 56” 19.86 Ophiuchus
Jul 13 2025 16h 28m 24s -14° 26’ 15” 19.90 Ophiuchus
Jul 14 2025 16h 28m 03s -14° 21’ 56” 19.95 Ophiuchus
Jul 15 2025 16h 27m 46s -14° 17’ 56” 19.99 Ophiuchus
Jul 16 2025 16h 27m 32s -14° 14’ 17” 20.03 Ophiuchus
Jul 17 2025 16h 27m 23s -14° 10’ 56” 20.07 Ophiuchus
Jul 18 2025 16h 27m 17s -14° 07’ 55” 20.11 Ophiuchus

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