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public  Greenwich, UK Greenwich, UK  ⓘ
TimezoneEurope/London
Sunrise: 5:06 
Transit: 12:56 
Sunset: 20:47
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Dwarf Planets and Asteroids » 

Asteroid 1999 KW4

Above the horizon.  Rise: 3:29 | Tran: 11:59 | Set: 20:27
Alt: 40.96°   Az: 99.88°   Direction: East

Asteroid 1999 KW4 is in the constellation of Aries, at a distance of 175,743,555.0 kilometers from Earth. The current Right Ascension is 02h 38m 59s and the Declination is +25° 36’ 31” (apparent coordinates). The magnitude of Asteroid 1999 KW4 is 16.49 (data provided by JPL Horizons).

Finder Charts

Map showing Asteroid 1999 KW4 in Aries on May, 17 2025. Field of view: 50x30 degrees
View interactive star map
Sky map showing Asteroid 1999 KW4 in Aries on May, 17 2025. Field of view: 15x9 degrees. View in interactive sky chart

High 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: 02h 37m 31s
Dec: +25° 29’ 59”
Deep sky finder chart for Asteroid 1999 KW4. Field of view: 60x40 arcmins. View in deep sky object tracker

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.

Celestial Coordinates

Apparent

02h 38m 59s
+25° 36’ 31”
20h 17m 38s
22h 56m 38s

J2000

02h 37m 31s
+25° 29’ 59”

Additional Information

Aries
16.49

Rise and Set Times

Today's rise, transit and set times of Asteroid 1999 KW4 from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 64.4°
Max altitude: 64.1°
Azimuth: 295.5°
  • 1999 WK4 is above the horizon from Greenwich, UK.
  • Right now it is placed in the East direction at an altitude of 40.96° above the horizon.
  • Given its current magnitude, 1999 WK4 is visible with the help of a telescope having an aperture of 20 inches (500mm) or more.
  • Go to interactive sky chart

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.

Distance from Earth

The distance of Asteroid 1999 KW4 from Earth is currently 175,743,555.0 kilometers, equivalent to 1.1747731046 Astronomical Units. Light takes 9m 46.217s to travel from Asteroid 1999 KW4 and arrive to us.

175,743,555.0
1.1747731046
9m 46.217s

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.

Chart of the distance of Asteroid 1999 KW4 from Earth in Astronomical Units (au)

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

Between 1 January 2000 and 31 December 2099, the closest approach of Asteroid 1999 KW4 to Earth happens on Mon May 26 2036 at a distance of 0.016364 Astronomical Units, or 2,448,009 kilometers:

Mon May 26 2036
2,448,009
0.016364

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

Light Curve

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.

Chart of the magnitude of Asteroid 1999 KW4 as a function of time

Orbital Elements

The following table lists the orbital elements of Asteroid 1999 KW4 at epoch 16 October 2024 00:00 UTC (JD: 2460600.5). Source: JPL Small-Body Database

Element Symbol Value
Orbit eccentricity e 0.68840424
Orbit inclination i 38.88151560°
Perihelion distance q 0.20016383 AU
29,944,082 km
Aphelion distance Q 1.08460221 AU
162,254,181 km
Semi-major axis a 0.64238302 AU
96,099,132 km
Orbital period period 0.5149 years
188.0570 days
Date of perihelion transit Tp 2024-Nov-18 23:04:57
2,460,633.4618 JD
Next perihelion transit 2025-May-26 00:27
2,460,821.5188 JD
Argument of perihelion peri 192.6481913155°
Longitude of the ascending node node 244.89778810003°
Mean anomaly M 296.90082834283°
Mean motion n 1.91431322°/day
2h1>Orbit Visualization
Orbit Diagram of Asteroid 1999 KW4
View Asteroid 1999 KW4 in the 3D Solar System Simulator

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. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Constellation
2025 May 10 01h 27m 05s +25° 14’ 42” 17.52 Pisces
2025 May 11 01h 36m 17s +25° 29’ 16” 17.42 Pisces
2025 May 12 01h 45m 42s +25° 40’ 36” 17.32 Pisces
2025 May 13 01h 55m 19s +25° 48’ 28” 17.19 Triangulum
2025 May 14 02h 05m 06s +25° 52’ 37” 17.06 Aries
2025 May 15 02h 15m 07s +25° 52’ 49” 16.91 Aries
2025 May 16 02h 25m 20s +25° 48’ 44” 16.74 Aries
2025 May 17 02h 35m 47s +25° 40’ 05” 16.55 Aries
2025 May 18 02h 46m 27s +25° 26’ 31” 16.34 Aries
2025 May 19 02h 57m 22s +25° 07’ 40” 16.10 Aries
2025 May 20 03h 08m 32s +24° 43’ 10” 15.83 Aries
2025 May 21 03h 19m 58s +24° 12’ 39” 15.54 Aries
2025 May 22 03h 31m 40s +23° 35’ 52” 15.20 Taurus
2025 May 23 03h 43m 35s +22° 52’ 40” 14.82 Taurus

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