2015 BK509
ephemeris date magn radius delta (AU) delta (LD) delta (km) ra dec elong phase
Today15 Dec 201924.01.459 AU0.728 AU283.17 LD108,868,078 km10h05m+20°58'116.1°37.3°
Brightest24 Feb 202017.91.031 AU0.057 AU22.32 LD8,581,263 km07h28m+22°59'135.6°42.2°
Approach28 Feb 202018.60.996 AU0.046 AU17.86 LD6,868,409 km04h57m+13°37'95.0°82.4°

Based on its absolute magnitude (Hₒ) of 22.4 and an albedo between 0.25 and 0.05, the estimated diameter of 2015 BK509 is 90 - 195 m.

2015 BK509- 2019-12-15
astro.vanbuitenen.nl


 
-1 year
-1 month
-1 day
Now
+1 day
+1 month
+1 year

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.