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🌎  Observing from: Greenwich, United Kingdom [change]

Asteroid 1999 KW4

Asteroid 1999 KW4 is currently in the constellation of Sagittarius. The current Right Ascension of Asteroid 1999 KW4 is 19h 05m 04s and the Declination is -16° 40’ 56” (topocentric coordinates computed for the selected location: Greenwich, United Kingdom [change]). The current magnitude of Asteroid 1999 KW4 is 19.33 (JPL).

Summary of key facts about Asteroid 1999 KW4 [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]:

19h 05m 04s
-16° 40’ 56”

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 1999 KW4 available on TheSkyLive:

Available Resources

Asteroid 1999 KW4 Position and Finder Charts

Below we provide Asteroid 1999 KW4 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 1999 KW4 in Sagittarius on February, 06 2023
Field of view: 50x30 degrees
View fullscreen
Map showing Asteroid 1999 KW4 in Sagittarius on February, 06 2023
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 1999 KW4 is right now. Click on the image to see a more detailed fullscreen tracker view.

1999 WK4
RA: 19h 05m 04s
Dec: -16° 40’ 56”
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 from Earth

The distance of Asteroid 1999 KW4 from Earth is currently 268,088,714 kilometers, equivalent to 1.792062 Astronomical Units. Light takes 14 minutes and 54.2477 seconds to travel from Asteroid 1999 KW4 and arrive to us.

14 minutes and 54.2477 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 0.016364 Astronomical Units, or 2,447,983 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 19.33.


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: 106.6°
Max altitude: 22.0°
Azimuth: 253.5°

The rise and set times are defined as the time at which the upper limb of Asteroid 1999 KW4 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 1999 KW4 Orbital Elements

The following table lists the orbital elements of Asteroid 1999 KW4 at epoch 24 February 2023 00:00 UTC (JD: 2460000.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.68837395
Orbit inclination i 38.87980957°
Perihelion distance q 0.20018255 AU
29,946,883 km
Aphelion distance Q 1.08457881 AU
162,250,681 km
Semi-major axis a 0.64238068 AU
96,098,782 km
Orbital period period 0.5149 years
188.0560 days
Date of perihelion transit Tp 2023-May-04 19:05:31
2,460,069.2955 JD
Argument of perihelion peri 192.64468933143°
Longitude of the ascending node node 244.89873427739°
Mean anomaly M 228.30314623535°
Mean motion n 1.91432366°/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
2023 Jan 30 18h 45m 01s -18° 29’ 47” 19.32 Sagittarius
2023 Jan 31 18h 47m 52s -18° 15’ 01” 19.33 Sagittarius
2023 Feb 01 18h 50m 43s -18° 00’ 00” 19.33 Sagittarius
2023 Feb 02 18h 53m 34s -17° 44’ 44” 19.33 Sagittarius
2023 Feb 03 18h 56m 26s -17° 29’ 12” 19.33 Sagittarius
2023 Feb 04 18h 59m 17s -17° 13’ 23” 19.33 Sagittarius
2023 Feb 05 19h 02m 09s -16° 57’ 20” 19.33 Sagittarius
2023 Feb 06 19h 05m 03s -16° 41’ 02” 19.33 Sagittarius
2023 Feb 07 19h 07m 55s -16° 24’ 25” 19.33 Sagittarius
2023 Feb 08 19h 10m 50s -16° 07’ 32” 19.33 Sagittarius
2023 Feb 09 19h 13m 44s -15° 50’ 23” 19.33 Sagittarius
2023 Feb 10 19h 16m 38s -15° 32’ 57” 19.32 Sagittarius
2023 Feb 11 19h 19m 35s -15° 15’ 11” 19.32 Sagittarius
2023 Feb 12 19h 22m 31s -14° 57’ 10” 19.32 Sagittarius