2021 AL1
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	15 Dec 2025	30.4	2.719 AU	2.448 AU	23h53m	-00°54'	95.1°	21.1°

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 2021 AL1 are:

            e (Eccentricity)                : 0.5754126
            a (Semimajor axis)              : 1.9891542
            i (Inclination)                 : 0.19663
            Ω (Longitude of ascending node) : 58.90320
            ω (Argument of perihelion)      : 112.82510
            M (Mean anomaly)                : 247.36202
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : -8.27158
            B (Latitude of perihelion)      : 0.18123
            P (Orbital period in years)     : 2.81            
        

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
2025-12-15 00:00 UT   23 53 02.2   +00 54 19     2.448    2.719   95.1   21.1    67   30.4 
2025-12-15 08:00 UT   23 53 08.9   +00 53 34     2.451    2.718   94.8   21.2    67   30.4 
2025-12-16 00:00 UT   23 53 22.8   +00 51 60     2.459    2.715   94.2   21.2    67   30.4 
2025-12-17 00:00 UT   23 53 44.8   +00 49 32     2.470    2.711   93.3   21.2    67   30.4 
2025-12-18 00:00 UT   23 54 08.0   +00 46 56     2.481    2.707   92.4   21.3    67   30.5 
2025-12-19 00:00 UT   23 54 32.6   +00 44 12     2.492    2.703   91.5   21.3    67   30.5 
2025-12-20 00:00 UT   23 54 58.3   +00 41 19     2.503    2.699   90.6   21.4    67   30.5 
2025-12-21 00:00 UT   23 55 25.4   +00 38 19     2.514    2.695   89.7   21.4    67   30.5 
2025-12-22 00:00 UT   23 55 53.6   +00 35 11     2.525    2.691   88.8   21.4    67   30.5 
2025-12-23 00:00 UT   23 56 23.1   +00 31 54     2.536    2.687   87.9   21.5    67   30.5 
2025-12-24 00:00 UT   23 56 53.7   +00 28 30     2.547    2.682   87.0   21.5    67   30.5 
2025-12-25 00:00 UT   23 57 25.5   +00 24 59     2.558    2.678   86.2   21.5    67   30.5 
2025-12-26 00:00 UT   23 57 58.5   +00 21 20     2.569    2.674   85.3   21.5    67   30.5 
2025-12-27 00:00 UT   23 58 32.6   +00 17 33     2.579    2.670   84.4   21.5    67   30.5 
2025-12-28 00:00 UT   23 59 07.9   +00 13 39     2.590    2.666   83.6   21.5    67   30.5 
2025-12-29 00:00 UT   23 59 44.3   +00 09 38     2.601    2.661   82.7   21.5    67   30.5 
2025-12-30 00:00 UT   00 00 21.7   +00 05 30     2.611    2.657   81.9   21.5    67   30.5 
2025-12-31 00:00 UT   00 01 00.2   +00 01 15     2.622    2.653   81.0   21.5    67   30.5 
2026-01-01 00:00 UT   00 01 39.8   +00 03 07     2.633    2.649   80.2   21.5    67   30.5 
2026-01-02 00:00 UT   00 02 20.4   +00 07 35     2.643    2.644   79.4   21.4    67   30.5 
2026-01-03 00:00 UT   00 03 02.1   +00 12 10     2.653    2.640   78.5   21.4    67   30.6 
2026-01-04 00:00 UT   00 03 44.8   +00 16 52     2.664    2.636   77.7   21.4    67   30.6 
2026-01-05 00:00 UT   00 04 28.5   +00 21 40     2.674    2.631   76.9   21.3    67   30.6 
2026-01-06 00:00 UT   00 05 13.1   +00 26 35     2.684    2.627   76.1   21.3    67   30.6 
2026-01-07 00:00 UT   00 05 58.8   +00 31 35     2.694    2.622   75.3   21.3    67   30.6 
2026-01-08 00:00 UT   00 06 45.4   +00 36 42     2.704    2.618   74.5   21.2    67   30.6 
2026-01-09 00:00 UT   00 07 33.0   +00 41 56     2.714    2.613   73.7   21.2    67   30.6 
2026-01-10 00:00 UT   00 08 21.5   +00 47 15     2.724    2.609   72.9   21.1    67   30.6 
2026-01-11 00:00 UT   00 09 10.9   +00 52 40     2.734    2.604   72.1   21.1    67   30.6 
2026-01-12 00:00 UT   00 10 01.3   +00 58 11     2.743    2.600   71.3   21.0    67   30.6 
2026-01-13 00:00 UT   00 10 52.6   +01 03 48     2.753    2.595   70.5   20.9    67   30.6 
2026-01-14 00:00 UT   00 11 44.8   +01 09 31     2.762    2.591   69.7   20.9    67   30.6 

    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.