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Asteroid 99942 Apophis

Asteroid 99942 Apophis is currently in the constellation of Gemini. The current Right Ascension of Asteroid 99942 Apophis is 07h 52m 26s and the Declination is +25° 56’ 01” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 99942 Apophis is 19.36 (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]:

07h 52m 26s
+25° 56’ 01”

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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 Gemini on May, 09 2021
Field of view: 50x30 degrees
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Map showing Asteroid 99942 Apophis in Gemini on May, 09 2021
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: 07h 52m 26s
Dec: +25° 56’ 01”
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 25,307,340 kilometers, equivalent to 0.169169 Astronomical Units. Light takes 1 minutes and 24.4162 seconds to travel from Asteroid 99942 Apophis and arrive to us.

1 minutes and 24.4162 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 19.36.


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: 64.0°
Max altitude: 64.7°
Azimuth: 295.9°

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 16 December 2020 00:00 UTC (JD: 2459200.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.19150887
Orbit inclination i 3.33677321°
Perihelion distance q 0.74585305 AU
111,578,028 km
Aphelion distance Q 1.09919637 AU
164,437,437 km
Semi-major axis a 0.92252471 AU
138,007,733 km
Orbital period period 0.8900 years
323.6424 days
Date of perihelion transit Tp 2020-Sep-08 12:58:55
2,459,101.0409 JD
Next perihelion transit 2021-Jul-29 04:24
2,459,424.6833 JD
Argument of perihelion peri 126.65395818773°
Longitude of the ascending node node 204.04199388877°
Mean anomaly M 110.63218105612°
Mean motion n 1.11233874°/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
2021 May 02 07h 56m 54s +23° 30’ 36” 18.96 Gemini
2021 May 03 07h 56m 26s +23° 50’ 56” 19.02 Gemini
2021 May 04 07h 55m 55s +24° 11’ 16” 19.07 Gemini
2021 May 05 07h 55m 23s +24° 31’ 37” 19.12 Gemini
2021 May 06 07h 54m 46s +24° 52’ 01” 19.18 Gemini
2021 May 07 07h 54m 06s +25° 12’ 29” 19.23 Gemini
2021 May 08 07h 53m 21s +25° 33’ 01” 19.29 Gemini
2021 May 09 07h 52m 35s +25° 53’ 35” 19.35 Gemini
2021 May 10 07h 51m 42s +26° 14’ 16” 19.42 Gemini
2021 May 11 07h 50m 45s +26° 35’ 02” 19.49 Gemini
2021 May 12 07h 49m 45s +26° 55’ 54” 19.55 Gemini
2021 May 13 07h 48m 38s +27° 16’ 50” 19.63 Gemini
2021 May 14 07h 47m 26s +27° 37’ 53” 19.70 Gemini
2021 May 15 07h 46m 08s +27° 59’ 02” 19.78 Gemini