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🌎  Greenwich, United Kingdom [change]

Asteroid 99942 Apophis

Asteroid 99942 Apophis is currently in the constellation of Leo. The current Right Ascension of Asteroid 99942 Apophis is 09h 40m 10s and the Declination is +11° 37’ 39” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 99942 Apophis is 21.48 (JPL).

Summary of key facts about Asteroid 99942 Apophis [tip: you can also create a Quick Access page for this data if you access it frequently and would like to have a simpler view]:

09h 40m 10s
+11° 37’ 39”
  • 99942 Apophis is above the horizon from Greenwich, United Kingdom [change].
  • It is visible looking in the South-West direction at an altitude of 38° above the horizon.
  • Given its current magnitude, 99942 Apophis is visible only through long exposure photography.
  • See also 99942 Apophis rise and set times.
  • 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.

Additional information about Asteroid 99942 Apophis available on TheSkyLive:

Available Resources

Asteroid 99942 Apophis Position and Finder Charts

Below we provide Asteroid 99942 Apophis finder charts showing where the object is right now in the sky with respect to the brightest stars. The first finder chart has a field of view of 50 degrees, while the second one has a field of view of 10 degrees. Click on each finder chart to access a full screen interactive Online Planetarium.

Map showing Asteroid 99942 Apophis in Leo on September, 28 2022
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid 99942 Apophis in Leo on September, 28 2022
Field of view: 10x6 degrees
View fullscreen
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Higher precision deep sky finder chart, 60 arcmin wide, showing where Asteroid 99942 Apophis is right now. Click on the image to see a more detailed fullscreen tracker view.

99942 Apophis
RA: 09h 40m 10s
Dec: +11° 37’ 39”
Deep sky finder chart for Asteroid 99942 Apophis
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Asteroid 99942 Apophis?, a page that provides all the information needed to find Asteroid 99942 Apophis in the sky and additional links to sky charts.

Asteroid 99942 Apophis Distance from Earth

The distance of Asteroid 99942 Apophis from Earth is currently 227,641,060 kilometers, equivalent to 1.521686 Astronomical Units. Light takes 12 minutes and 39.3288 seconds to travel from Asteroid 99942 Apophis and arrive to us.

12 minutes and 39.3288 seconds

The following chart shows the distance of Asteroid 99942 Apophis 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.

Distance of Asteroid 99942 Apophis from Earth between January 2013 and December 2100

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 99942 Apophis from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Asteroid 99942 Apophis to Earth

Between January 2013 and December 2100, the closest approach of Asteroid 99942 Apophis to Earth happens on Sat Apr 14 2029 at a distance of 0.000438 Astronomical Units, or 65,520 kilometers:

Sat Apr 14 2029

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

Asteroid 99942 Apophis brightness

The current visual magnitude of Asteroid 99942 Apophis is 21.48.


The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 99942 Apophis, 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.

Predicted magnitude of Asteroid 99942 Apophis between January 2013 and December 2100

Asteroid 99942 Apophis rise and set times

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Asteroid 99942 Apophis rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 78.3°
Max altitude: 50.2°
Azimuth: 281.6°

The rise and set times are defined as the time at which the upper limb of Asteroid 99942 Apophis touches the horizon, considering the effect of the atmospheric refraction. As the atmospheric conditions cannot be modeled precisely the times reported here should be considered correct with an approximation of few minutes.

Asteroid 99942 Apophis Orbital Elements

The following table lists the orbital elements of Asteroid 99942 Apophis at epoch 08 August 2022 00:00 UTC (JD: 2459800.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.19145751
Orbit inclination i 3.33919184°
Perihelion distance q 0.74605076 AU
111,607,606 km
Aphelion distance Q 1.09937053 AU
164,463,490 km
Semi-major axis a 0.92271064 AU
138,035,548 km
Orbital period period 0.8864 years
323.7403 days
Date of perihelion transit Tp 2022-Jun-17 18:48:09
2,459,748.2834 JD
Next perihelion transit 2023-May-07 12:34
2,460,072.0237 JD
Argument of perihelion peri 126.60026629853°
Longitude of the ascending node node 203.95842326306°
Mean anomaly M 58.064946040899°
Mean motion n 1.11200254°/day

Visualization of Asteroid 99942 Apophis Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 99942 Apophis with respect of the Sun and the orbits of the major planets. The position of Asteroid 99942 Apophis and the planets along their orbits in this diagram accurately represents the current configuration of the objects in the Solar System. This is an experimental feature and it requires a WebGL enabled browser. Please provide us feedback!

Orbit Diagram of Asteroid 99942 Apophis
View Asteroid 99942 Apophis in the 3D Solar System Simulator

Asteroid 99942 Apophis Physical Data

The following shows the known values of the most important physical parameters of Asteroid 99942 Apophis. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 0.325 km 0.0000
Sideral Rotation 30.4000 hours 1.2701
Absolute Magnitude 19.7
Geometric Albedo 0.23

Asteroid 99942 Apophis 15 Days Ephemeris

The following table lists the ephemerides of Asteroid 99942 Apophis computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 99942 Apophis in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2022 Sep 21 09h 14m 52s +13° 46’ 03” 21.44 Cancer
2022 Sep 22 09h 18m 16s +13° 29’ 22” 21.45 Cancer
2022 Sep 23 09h 21m 41s +13° 12’ 33” 21.45 Cancer
2022 Sep 24 09h 25m 05s +12° 55’ 36” 21.46 Leo
2022 Sep 25 09h 28m 27s +12° 38’ 30” 21.47 Leo
2022 Sep 26 09h 31m 50s +12° 21’ 15” 21.47 Leo
2022 Sep 27 09h 35m 11s +12° 03’ 55” 21.48 Leo
2022 Sep 28 09h 38m 30s +11° 46’ 26” 21.48 Leo
2022 Sep 29 09h 41m 50s +11° 28’ 50” 21.49 Leo
2022 Sep 30 09h 45m 10s +11° 11’ 06” 21.50 Leo
2022 Oct 01 09h 48m 29s +10° 53’ 16” 21.50 Leo
2022 Oct 02 09h 51m 46s +10° 35’ 20” 21.51 Leo
2022 Oct 03 09h 55m 03s +10° 17’ 17” 21.51 Leo
2022 Oct 04 09h 58m 19s +09° 59’ 08” 21.52 Leo