2009 BG81
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	23 Jun 2026	30.2	1.964 AU	1.008 AU	20h02m	-18°03'	152.1°	14.0°

The interactive orbit chart above shows the body'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 orbital elements of 2009 BG81 are:

            e (Eccentricity)                : 0.4597177
            a (Semimajor axis)              : 1.7952137
            i (Inclination)                 : 3.05071
            Ω (Longitude of ascending node) : 128.24596
            ω (Argument of perihelion)      : 29.35556
            M (Mean anomaly)                : 348.36487
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 157.56681
            B (Latitude of perihelion)      : 1.49501
            P (Orbital period in years)     : 2.41            
        

The light curve chart below shows the estimated development of the minor planet's magnitude.

The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.

The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-06-23 00:00 UT   20 02 32.4   -18 03 57     1.008    1.964  152.1   14.0   254   30.2 
2026-06-23 00:24 UT   20 02 30.9   -18 04 03     1.008    1.965  152.1   14.0   254   30.2 
2026-06-24 00:00 UT   20 01 06.6   -18 09 31     1.008    1.970  153.4   13.4   254   30.2 
2026-06-25 00:00 UT   19 59 39.2   -18 15 09     1.008    1.975  154.7   12.7   254   30.1 
2026-06-26 00:00 UT   19 58 10.3   -18 20 50     1.008    1.980  156.0   12.0   254   30.1 
2026-06-27 00:00 UT   19 56 40.1   -18 26 34     1.008    1.985  157.4   11.4   253   30.1 
2026-06-28 00:00 UT   19 55 08.5   -18 32 20     1.009    1.991  158.7   10.7   253   30.1 
2026-06-29 00:00 UT   19 53 35.7   -18 38 09     1.010    1.996  160.0   10.0   253   30.1 
2026-06-30 00:00 UT   19 52 01.9   -18 43 58     1.011    2.001  161.3    9.4   253   30.1 
2026-07-01 00:00 UT   19 50 27.1   -18 49 49     1.013    2.006  162.7    8.7   252   30.0 
2026-07-02 00:00 UT   19 48 51.5   -18 55 40     1.014    2.011  164.0    8.0   252   30.0 
2026-07-03 00:00 UT   19 47 15.2   -19 01 31     1.016    2.016  165.3    7.3   252   30.0 
2026-07-04 00:00 UT   19 45 38.3   -19 07 21     1.018    2.021  166.7    6.7   251   30.0 
2026-07-05 00:00 UT   19 44 00.9   -19 13 10     1.021    2.026  168.0    6.0   250   29.9 
2026-07-06 00:00 UT   19 42 23.2   -19 18 58     1.023    2.031  169.3    5.3   249   29.9 
2026-07-07 00:00 UT   19 40 45.2   -19 24 45     1.026    2.036  170.7    4.6   248   29.9 
2026-07-08 00:00 UT   19 39 07.2   -19 30 29     1.030    2.041  172.0    4.0   246   29.9 
2026-07-09 00:00 UT   19 37 29.2   -19 36 10     1.033    2.046  173.3    3.3   244   29.9 
2026-07-10 00:00 UT   19 35 51.4   -19 41 48     1.037    2.051  174.6    2.7   240   29.8 
2026-07-11 00:00 UT   19 34 13.8   -19 47 23     1.041    2.056  175.8    2.1   234   29.8 
2026-07-12 00:00 UT   19 32 36.7   -19 52 54     1.045    2.061  177.0    1.5   224   29.8 
2026-07-13 00:00 UT   19 31 00.2   -19 58 22     1.049    2.066  177.9    1.0   201   29.7 
2026-07-14 00:00 UT   19 29 24.4   -20 03 44     1.054    2.071  178.2    0.9   162   29.7 
2026-07-15 00:00 UT   19 27 49.3   -20 09 02     1.059    2.075  177.6    1.2   128   29.8 

    Terminology:
            
    delta:  distance between minor planet and earth in AU
    radius: distance between minor planet 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-minor planet)    
    phase:  phase angle in degrees (angle sun-minor planet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    

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.