Your guide to the Solar System
🌎 Location: Greenwich, United Kingdom [change]
Dwarf Planets and Asteroids » 

Asteroid 99942 Apophis

Available Resources

Asteroid 99942 Apophis Position

Asteroid 99942 Apophis is currently in the constellation of Leo. The current Right Ascension is 09h 31m 32s and the Declination is +13° 51’ 03”.

09h 31m 32s
+13° 51’ 03”

Simplified sky chart showing where Asteroid 99942 Apophis is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Asteroid 99942 Apophis in Leo on June, 25 2019
Field of view: 60x30 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]

Hihgher precision deep sky finder chart showing where Asteroid 99942 Apophis is right now (view fullscreen)

99942 Apophis
RA: 09h 31m 32s
Dec: +13° 51’ 03”
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

The distance of Asteroid 99942 Apophis from Earth is currently 214,182,978 kilometers, equivalent to 1.431725 Astronomical Units. Light takes 11 minutes and 54.4375 seconds to travel from Asteroid 99942 Apophis and arrive to us.

214,182,978
1.431725
11 minutes and 54.4375 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 0.00043719 Astronomical Units, or 65,403 kilometers:

Sat Apr 14 2029
65,403
0.000437

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 22.13.

22.13

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: 76.1°
Max altitude: 52.3°
Azimuth: 283.8°
Asteroid 99942 Apophis is above the horizon from Greenwich, United Kingdom

The rise and set times are defined as the time at which the upper limb of Asteroid 99942 Apophis touches the horizon, consideting the effect of the atmospheric refraction. As the atmoshpere 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 23 September 2008 00:00 UTC (JD: 2454733.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.19119530
Orbit inclination i 3.33136952°
Perihelion distance q 0.74607243 AU
111,610,847 km
Aphelion distance Q 1.09880417 AU
164,378,765 km
Semi-major axis a 0.92243830 AU
137,994,806 km
Orbital period period 0.8900 years
323.5969 days
Date of perihelion transit Tp 2009-Mar-04 09:54:01
2,454,894.9125 JD
Next perihelion transit 2010-Jan-22 00:13
2,455,218.5095 JD
Argument of perihelion peri 126.40187952485°
Longitude of the ascending node node 204.44602891898°
Mean anomaly M 180.42937304564°
Mean motion n 1.11249504°/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
2019 Jun 18 09h 06m 32s +15° 30’ 05” 22.16 Cancer
2019 Jun 19 09h 09m 51s +15° 17’ 33” 22.16 Cancer
2019 Jun 20 09h 13m 12s +15° 04’ 50” 22.15 Cancer
2019 Jun 21 09h 16m 32s +14° 51’ 55” 22.15 Cancer
2019 Jun 22 09h 19m 50s +14° 38’ 48” 22.15 Cancer
2019 Jun 23 09h 23m 09s +14° 25’ 30” 22.14 Leo
2019 Jun 24 09h 26m 29s +14° 12’ 02” 22.14 Leo
2019 Jun 25 09h 29m 48s +13° 58’ 22” 22.14 Leo
2019 Jun 26 09h 33m 06s +13° 44’ 30” 22.13 Leo
2019 Jun 27 09h 36m 24s +13° 30’ 29” 22.13 Leo
2019 Jun 28 09h 39m 42s +13° 16’ 17” 22.12 Leo
2019 Jun 29 09h 43m 00s +13° 01’ 54” 22.12 Leo
2019 Jun 30 09h 46m 18s +12° 47’ 21” 22.11 Leo
2019 Jul 01 09h 49m 35s +12° 32’ 36” 22.11 Leo