2018 PK21
ephemeris date magn radius delta (AU) delta (LD) delta (km) ra dec elong phase
Brightest27 Nov 202021.30.996 AU0.036 AU14.13 LD5,431,856 km10h13m+42°07'104.0°74.0°
Today3 Dec 202021.40.988 AU0.033 AU12.66 LD4,866,844 km11h28m+36°09'93.2°84.9°
Approach8 Dec 202021.80.981 AU0.031 AU12.19 LD4,685,644 km12h34m+27°10'81.3°96.9°

Based on its absolute magnitude (Hₒ) of 25.9 and an albedo between 0.25 and 0.05, the estimated diameter of 2018 PK21 is 20 - 40 m.

2018 PK21- 2020-12-03
astro.vanbuitenen.nl


 
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The interactive orbit chart above shows the near-earth object's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below.

(Left-click and drag to rotate the view; right-click and drag to move the view; use scroll wheel to zoom in our out.)

The light curve chart below shows the estimated development of the NEO's magnitude during its approach to earth.


The following all-sky chart shows the path of the NEO in the coming months.





The following chart shows the path of the NEO in the coming days or hours. The field of view is optimized for (~10x50) binoculars and finderscopes. A more printer-friendly version of the same chart can be found below.


    Terminology:
            
    delta:  distance between NEO and earth in AU or LD 
    radius: distance between NEO and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-NEO)    
    phase:  phase angle in degrees (angle sun-NEO-earth)        
    AU:     Astronomical Unit: mean distance between earth and sun (149597870.7 km)
    LD:     Lunar distance: Mean distance between earth and the moon (~0.00257 AU)
    

Orbital elements provided by the MPC (Minor Planet Center).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.