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

Asteroid 1999 KW4

Available Resources

Asteroid 1999 KW4 Position

Asteroid 1999 KW4 is currently in the constellation of Coma. The current Right Ascension is 12h 55m 43s and the Declination is +21° 05’ 44”.

12h 55m 43s
+21° 05’ 44”

Simplified sky chart showing where Asteroid 1999 KW4 is right now in the sky with respect to the brightest stars and constellations (see fuillscreen Online Planetarium)

Map showing Asteroid 1999 KW4 in Coma 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 1999 KW4 is right now (view fullscreen)

1999 WK4
RA: 12h 55m 43s
Dec: +21° 05’ 44”
Deep sky finder chart for Asteroid 1999 KW4
Field of view: 60x40 arcmins
View fullscreen

Also check out Where is Asteroid 1999 KW4?, a page that provides all the information needed to find Asteroid 1999 KW4 in the sky and additional links to sky charts.

Asteroid 1999 KW4 Distance

The distance of Asteroid 1999 KW4 from Earth is currently 55,422,263 kilometers, equivalent to 0.370475 Astronomical Units. Light takes 3 minutes and 4.8688 seconds to travel from Asteroid 1999 KW4 and arrive to us.

3 minutes and 4.8688 seconds

The following chart shows the distance of Asteroid 1999 KW4 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 1999 KW4 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 1999 WK4 from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest approach of Asteroid 1999 KW4 to Earth

Between January 2013 and December 2100 the closest approach of Asteroid 1999 KW4 to Earth happens on Mon May 26 2036 at a distance of 0.01636313 Astronomical Units, or 2,447,889 kilometers:

Mon May 26 2036

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

Asteroid 1999 KW4 brightness

The current visual magnitude of Asteroid 1999 KW4 is 16.96.


The following chart is the predicted light curve (visual magnitude as a function of time) of Asteroid 1999 KW4, 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 1999 KW4 between January 2013 and December 2100

Asteroid 1999 KW4 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 1999 KW4 rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 68.9°
Max altitude: 59.6°
Azimuth: 291.1°
Asteroid 1999 KW4 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 1999 KW4 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 1999 KW4 Orbital Elements

The following table lists the orbital elements of Asteroid 1999 KW4 at epoch 26 April 2019 00:00 UTC (JD: 2458600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.68872023
Orbit inclination i 38.88256484°
Perihelion distance q 0.19990250 AU
29,904,988 km
Aphelion distance Q 1.08448869 AU
162,237,200 km
Semi-major axis a 0.64219560 AU
96,071,094 km
Orbital period period 0.5100 years
187.9747 days
Date of perihelion transit Tp 2019-Mar-22 10:46:06
2,458,564.9487 JD
Next perihelion transit 2019-Sep-26 10:09
2,458,752.9234 JD
Argument of perihelion peri 192.61843170389°
Longitude of the ascending node node 244.90961476317°
Mean anomaly M 68.086137858887°
Mean motion n 1.91515130°/day

Visualization of Asteroid 1999 KW4 Orbit

This 3d orbit diagram is a feature of our 3D Solar System Simulator and shows the orbit of Asteroid 1999 KW4 with respect of the Sun and the orbits of the major planets. The position of Asteroid 1999 KW4 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 1999 KW4
View Asteroid 1999 KW4 in the 3D Solar System Simulator

Asteroid 1999 KW4 15 Days Ephemeris

The following table lists the ephemerides of Asteroid 1999 KW4 computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Asteroid 1999 KW4 in our Online Planetarium at the chosen date.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2019 Jun 18 12h 47m 02s +20° 18’ 55” 16.36 Coma
2019 Jun 19 12h 48m 20s +20° 27’ 37” 16.45 Coma
2019 Jun 20 12h 49m 36s +20° 35’ 21” 16.54 Coma
2019 Jun 21 12h 50m 47s +20° 42’ 17” 16.62 Coma
2019 Jun 22 12h 51m 55s +20° 48’ 28” 16.70 Coma
2019 Jun 23 12h 53m 00s +20° 53’ 58” 16.78 Coma
2019 Jun 24 12h 54m 05s +20° 58’ 54” 16.85 Coma
2019 Jun 25 12h 55m 05s +21° 03’ 15” 16.92 Coma
2019 Jun 26 12h 56m 06s +21° 07’ 09” 16.99 Coma
2019 Jun 27 12h 57m 02s +21° 10’ 36” 17.05 Coma
2019 Jun 28 12h 58m 00s +21° 13’ 38” 17.11 Coma
2019 Jun 29 12h 58m 54s +21° 16’ 18” 17.17 Coma
2019 Jun 30 12h 59m 48s +21° 18’ 39” 17.23 Coma
2019 Jul 01 13h 00m 42s +21° 20’ 43” 17.29 Coma