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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 4:58 
Transit: 13:04 
Sunset: 21:09
sunny   (Daytime)   What's Visible Now?
Dwarf Planets and Asteroids » 

Asteroid 5 Astraea

Above the horizon.  Rise: 8:23 | Tran: 15:33 | Set: 22:43
Altitude: 20.4°   Azimuth: 266.4°   Direction: West

Asteroid 5 Astraea is in the constellation of Leo, at a distance of 427,113,150 kilometers from Earth. The current Right Ascension is 10h 03m 04s and the Declination is +13° 35’ 35” (apparent coordinates). The magnitude of Asteroid 5 Astraea is 11.79 (data provided by JPL Horizons).

Finder chart of 5 Astraea in Leo on July,13 2024
Map showing Asteroid 5 Astraea in Leo on July, 13 2024. Field of view: 50x30 degrees
View interactive star map

5 Astraea is a relatively small main-belt asteroid located between the orbits of Mars and Jupiter. It was discovered 8 December 1845 by German astronomer Karl Ludwig Hencke and is named after the Greek goddess of justice. Astraea has a diameter of approximately 119 kilometers and is irregularly shaped, with a rotation period of about 16 hours. Its surface is covered in numerous impact craters, some of which are several kilometers in diameter. Astraea's composition is thought to be a mixture of rock and metal, similar to the composition of the Earth's crust. It has a relatively low density compared to other asteroids, indicating that it may have a porous interior. Astraea orbits the Sun once every 4.14 Earth years and has been observed by ground-based telescopes, which have revealed insights into its geology, composition, and history.

Celestial Coordinates

Apparent

10h 03m 04s
+13° 35’ 35”
04h 57m 08s

J2000

10h 01m 44s
+13° 42’ 43”

Additional Information

Leo
11.79

Rise and Set Times

Today's rise, transit and set times of Asteroid 5 Astraea from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 76.2°
Max altitude: 52.3°
Azimuth: 283.7°
  • 5 Astraea is above the horizon from Greenwich, UK.
  • Right now it is placed in the West direction at an altitude of 20° above the horizon.
  • Given its current magnitude, 5 Astraea is visible with the help of a telescope having an aperture of 4 inches (100mm) or more.
  • Go to interactive sky chart

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.

Finder Charts

Finder chart of 5 Astraea
Sky map showing Asteroid 5 Astraea in Leo on July, 13 2024. Field of view: 10x6 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Asteroid 5 Astraea is right now. Click on the image to see a more detailed fullscreen tracker view.

5 Astraea
RA: 10h 01m 44s
Dec: +13° 42’ 43”
Deep sky finder chart for Asteroid 5 Astraea. Field of view: 60x40 arcmins. View in deep sky object tracker

Also check out Where is Asteroid 5 Astraea?, a page that provides all the information needed to find Asteroid 5 Astraea in the sky and additional links to sky charts.

Distance from Earth

The distance of Asteroid 5 Astraea from Earth is currently 427,113,150 kilometers, equivalent to 2.855075 Astronomical Units. Light takes 23 minutes and 44.6961 seconds to travel from Asteroid 5 Astraea and arrive to us.

427,113,150
2.855075
23 minutes and 44.6961 seconds

The following chart shows the distance of Asteroid 5 Astraea from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Chart of the distance of Asteroid 5 Astraea from Earth in Astronomical Units (au)

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of 5 Astraea from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach

Between 1 January 1900 and 31 December 2099, the closest approach of Asteroid 5 Astraea to Earth happens on Fri Feb 13 1925 at a distance of 1.093100 Astronomical Units, or 163,525,365 kilometers:

Fri Feb 13 1925
163,525,365
1.093100

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

Light Curve

The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 5 Astraea, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Chart of the magnitude of Asteroid 5 Astraea as a function of time

Orbital Elements

The following table lists the orbital elements of Asteroid 5 Astraea at epoch 24 February 2023 00:00 UTC (JD: 2460000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.18792368
Orbit inclination i 5.36012857°
Perihelion distance q 2.09409950 AU
313,272,827 km
Aphelion distance Q 3.06329633 AU
458,262,609 km
Semi-major axis a 2.57869792 AU
385,767,718 km
Orbital period period 4.1410 years
1,512.5131 days
Date of perihelion transit Tp 2024-May-06 19:49:09
2,460,437.3258 JD
Next perihelion transit 2028-Jun-27 08:07
2,461,949.8389 JD
Argument of perihelion peri 358.88655645318°
Longitude of the ascending node node 141.52276093715°
Mean anomaly M 256.0291368156°
Mean motion n 0.23801448°/day

Orbit Visualization

Orbit Diagram of Asteroid 5 Astraea
View Asteroid 5 Astraea in the 3D Solar System Simulator

Physical Data

The following shows the known values of the most important physical parameters of Asteroid 5 Astraea. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 119.07 km 0.0093
Sideral Rotation 16.8000 hours 0.7019
Absolute Magnitude 6.85
Geometric Albedo 0.2268

15 Days Ephemeris

The following table lists the ephemerides of Asteroid 5 Astraea 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
2024 Jul 06 09h 47m 00s +14° 50’ 25” 11.79 Leo
2024 Jul 07 09h 49m 03s +14° 41’ 05” 11.79 Leo
2024 Jul 08 09h 51m 07s +14° 31’ 42” 11.79 Leo
2024 Jul 09 09h 53m 10s +14° 22’ 14” 11.79 Leo
2024 Jul 10 09h 55m 14s +14° 12’ 40” 11.79 Leo
2024 Jul 11 09h 57m 17s +14° 03’ 03” 11.79 Leo
2024 Jul 12 09h 59m 20s +13° 53’ 21” 11.79 Leo
2024 Jul 13 10h 01m 23s +13° 43’ 36” 11.79 Leo
2024 Jul 14 10h 03m 27s +13° 33’ 45” 11.79 Leo
2024 Jul 15 10h 05m 30s +13° 23’ 50” 11.79 Leo
2024 Jul 16 10h 07m 32s +13° 13’ 51” 11.79 Leo
2024 Jul 17 10h 09m 35s +13° 03’ 49” 11.79 Leo
2024 Jul 18 10h 11m 37s +12° 53’ 42” 11.79 Leo
2024 Jul 19 10h 13m 40s +12° 43’ 31” 11.79 Leo

Additional Resources