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Asteroid 1999 KW4

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Asteroid 1999 KW4 Position

Asteroid 1999 KW4 is currently in the constellation of Coma. The current Right Ascension is 13h 21m 45s and the Declination is +21° 35’ 25”.

13h 21m 45s
+21° 35’ 25”

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 August, 21 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: 13h 21m 45s
Dec: +21° 35’ 25”
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 115,179,313 kilometers, equivalent to 0.769926 Astronomical Units. Light takes 6 minutes and 24.1968 seconds to travel from Asteroid 1999 KW4 and arrive to us.

6 minutes and 24.1968 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 18.24.


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: 68.4°
Max altitude: 60.1°
Azimuth: 291.6°
Asteroid 1999 KW4 is below 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 38.88256474°
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 192.61843184481°
Longitude of the ascending node node 244.90961474157°
Mean anomaly M 68.086137302297°
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 Aug 14 13h 23m 51s +21° 30’ 37” 18.26 Coma
2019 Aug 15 13h 23m 44s +21° 31’ 14” 18.26 Coma
2019 Aug 16 13h 23m 36s +21° 31’ 54” 18.26 Coma
2019 Aug 17 13h 23m 24s +21° 32’ 34” 18.26 Coma
2019 Aug 18 13h 23m 08s +21° 33’ 15” 18.25 Coma
2019 Aug 19 13h 22m 48s +21° 33’ 56” 18.25 Coma
2019 Aug 20 13h 22m 23s +21° 34’ 36” 18.24 Coma
2019 Aug 21 13h 21m 54s +21° 35’ 16” 18.24 Coma
2019 Aug 22 13h 21m 19s +21° 35’ 51” 18.23 Coma
2019 Aug 23 13h 20m 39s +21° 36’ 20” 18.23 Coma
2019 Aug 24 13h 19m 54s +21° 36’ 43” 18.22 Coma
2019 Aug 25 13h 19m 01s +21° 37’ 00” 18.22 Coma
2019 Aug 26 13h 18m 02s +21° 37’ 04” 18.21 Coma
2019 Aug 27 13h 16m 57s +21° 36’ 55” 18.20 Coma