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public  Arklow, Irlanda Arklow, Irlanda  ⓘ
TimezoneEurope/Dublin
Sunrise: 5:09 
Transit: 13:29 
Sunset: 21:48
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Dwarf Planets and Asteroids » 

Asteroid 3 Juno

Above the horizon.  Rise: 15:53 | Tran: 21:40 | Set: 3:32
Alt: 30.97°   Az: 149.18°   Direction: South-South-East

Asteroid 3 Juno is in the constellation of Libra, at a distance of 405,737,961.0 kilometers from Earth. The current Right Ascension is 15h 12m 45s and the Declination is -02° 01’ 59” (apparent coordinates). The magnitude of asteroid 3 Juno is 10.61.

Finder Charts

The sky charts below show, at different resolutions, the position of asteroid 3 Juno in the sky. Click on each chart to access the interactive star map tool.

Star map showing the position of asteroid 3 Juno in the constellation of Libra on F, d Y. Field of view: 50x30 degrees. View interactive star map.
Star map showing the position of asteroid 3 Juno in the constellation of Libra 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 3 Juno 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.

3 Juno
RA: 15h 11m 26s
Dec: -01° 56’ 18”
Simplified high-resolution deep sky chart showing the current position of asteroid 3 Juno. Field of view: 60 x 40 arcminutes. Go to the dedicated page

Equatorial Coordinates

Apparent

15h 12m 45s
-02° 01’ 59”
22h 15m 40s
13h 28m 25s

J2000

15h 11m 26s
-01° 56’ 18”

Additional Information

Libra
10.61

Rise and Set Times

The following table lists today's rise, transit and set times of asteroid 3 Juno from Arklow, Irlanda (all times relative to the local timezone Europe/Dublin):

Azimuth: 92.0°
Max altitude: 35.2°
Azimuth: 268.0°

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 3 Juno from Earth is currently 405,737,961.0 kilometers, equivalent to 2.7121907491 Astronomical Units. Light takes 22m 33.396s to travel from asteroid 3 Juno and arrive to us.

405,737,961.0
2.7121907491
22m 33.396s

The following graph shows the distance of asteroid 3 Juno 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 3 Juno 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 3 Juno 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, 1600 and December 30, 2499, the closest approach of asteroid 3 Juno to Earth happened on Thursday 5 November 1874 at a distance of 1.028769 Astronomical Units, or 153,901,649 kilometers:

Thursday 5 November 1874
153,901,649
1.028769

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 3 Juno, 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 3 Juno as a function of time

Orbital Elements

The following table lists the orbital elements of asteroid 3 Juno at epoch February, 24 2023 00:00 UTC (JD: 2460000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.25646772
Orbit inclination i 12.99066193°
Perihelion distance q 1.98533293 AU
297,001,580 km
Aphelion distance Q 3.35494071 AU
501,891,988 km
Semi-major axis a 2.67013682 AU
399,446,784 km
Orbital period period 4.3632 years
1,593.6711 days
Date of perihelion transit Tp April 2, 2023
2,460,036.6935 JD
Next perihelion transit August 12, 2027
2,461,630.3646 JD
Argument of perihelion peri 247.73653371045°
Longitude of the ascending node node 169.84300685997°
Mean anomaly M 351.82411888186°
Mean motion n 0.22589353°/day

Orbit Visualization

The following chart is a 3D animated visualization of the orbit of asteroid 3 Juno relative to the other major objects in the Solar System. You can access more advanced features using our 3D Solar System Viewer.

Physical Properties

The table below lists the known key physical properties of asteroid 3 Juno. The source for this data is the JPL Small-Body Database.

Physical Parameter Value Relative to Earth
Diameter 233.92 km 0.0184
Sideral Rotation 7.2100 hours 0.3012
Absolute Magnitude 5.33
Geometric Albedo 0.2383

15 Days Ephemeris

The following table lists the ephemerides of asteroid 3 Juno 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
Jun 28 2025 15h 14m 39s -01° 44’ 02” 10.50 Serpens
Jun 29 2025 15h 14m 20s -01° 45’ 57” 10.52 Serpens
Jun 30 2025 15h 14m 03s -01° 47’ 59” 10.53 Serpens
Jul 01 2025 15h 13m 47s -01° 50’ 07” 10.54 Serpens
Jul 02 2025 15h 13m 31s -01° 52’ 24” 10.56 Serpens
Jul 03 2025 15h 13m 17s -01° 54’ 46” 10.57 Serpens
Jul 04 2025 15h 13m 05s -01° 57’ 16” 10.59 Serpens
Jul 05 2025 15h 12m 53s -01° 59’ 52” 10.60 Serpens
Jul 06 2025 15h 12m 43s -02° 02’ 34” 10.61 Libra
Jul 07 2025 15h 12m 33s -02° 05’ 23” 10.63 Libra
Jul 08 2025 15h 12m 25s -02° 08’ 19” 10.64 Libra
Jul 09 2025 15h 12m 18s -02° 11’ 20” 10.65 Libra
Jul 10 2025 15h 12m 13s -02° 14’ 27” 10.67 Libra
Jul 11 2025 15h 12m 08s -02° 17’ 39” 10.68 Libra

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