2021 AL1
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	16 Oct 2025	29.5	2.920 AU	1.956 AU	00h17m	+01°37'	162.1°	6.0°

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 2021 AL1 are:

            e (Eccentricity)                : 0.5752938
            a (Semimajor axis)              : 1.9892809
            i (Inclination)                 : 0.19668
            Ω (Longitude of ascending node) : 58.88508
            ω (Argument of perihelion)      : 112.84336
            M (Mean anomaly)                : 177.09272
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : -8.27144
            B (Latitude of perihelion)      : 0.18125
            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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-16 00:00 UT   00 17 11.5   +01 37 23     1.956    2.920  162.1    6.0    66   29.5 
2025-10-16 02:04 UT   00 17 06.0   +01 36 48     1.956    2.920  161.9    6.1    66   29.5 
2025-10-17 00:00 UT   00 16 08.1   +01 30 36     1.958    2.918  160.8    6.5    66   29.6 
2025-10-18 00:00 UT   00 15 05.4   +01 23 54     1.961    2.915  159.5    6.9    66   29.6 
2025-10-19 00:00 UT   00 14 03.6   +01 17 16     1.963    2.912  158.2    7.3    66   29.6 
2025-10-20 00:00 UT   00 13 02.6   +01 10 45     1.967    2.909  157.0    7.7    66   29.6 
2025-10-21 00:00 UT   00 12 02.6   +01 04 19     1.970    2.906  155.7    8.1    66   29.6 
2025-10-22 00:00 UT   00 11 03.5   +00 57 60     1.974    2.903  154.4    8.5    66   29.7 
2025-10-23 00:00 UT   00 10 05.4   +00 51 47     1.978    2.901  153.2    8.9    66   29.7 
2025-10-24 00:00 UT   00 09 08.5   +00 45 41     1.982    2.898  151.9    9.3    66   29.7 
2025-10-25 00:00 UT   00 08 12.6   +00 39 43     1.986    2.895  150.7    9.7    66   29.7 
2025-10-26 00:00 UT   00 07 17.9   +00 33 52     1.991    2.892  149.4   10.1    66   29.7 
2025-10-27 00:00 UT   00 06 24.4   +00 28 09     1.996    2.889  148.2   10.5    66   29.7 
2025-10-28 00:00 UT   00 05 32.1   +00 22 35     2.002    2.886  147.0   10.8    66   29.8 
2025-10-29 00:00 UT   00 04 41.1   +00 17 08     2.007    2.883  145.7   11.2    66   29.8 
2025-10-30 00:00 UT   00 03 51.4   +00 11 50     2.013    2.880  144.5   11.6    66   29.8 
2025-10-31 00:00 UT   00 03 03.1   +00 06 41     2.019    2.877  143.3   11.9    66   29.8 
2025-11-01 00:00 UT   00 02 16.1   +00 01 41     2.025    2.874  142.1   12.3    66   29.8 
2025-11-02 00:00 UT   00 01 30.6   +00 03 10     2.032    2.871  140.9   12.6    66   29.9 
2025-11-03 00:00 UT   00 00 46.4   +00 07 52     2.038    2.867  139.7   12.9    66   29.9 
2025-11-04 00:00 UT   00 00 03.7   +00 12 24     2.045    2.864  138.5   13.3    66   29.9 
2025-11-05 00:00 UT   23 59 22.5   +00 16 47     2.052    2.861  137.3   13.6    66   29.9 
2025-11-06 00:00 UT   23 58 42.7   +00 21 00     2.060    2.858  136.1   13.9    66   29.9 
2025-11-07 00:00 UT   23 58 04.4   +00 25 03     2.067    2.855  134.9   14.2    66   29.9 
2025-11-08 00:00 UT   23 57 27.7   +00 28 57     2.075    2.852  133.7   14.5    66   30.0 
2025-11-09 00:00 UT   23 56 52.4   +00 32 40     2.083    2.848  132.6   14.8    66   30.0 
2025-11-10 00:00 UT   23 56 18.7   +00 36 14     2.091    2.845  131.4   15.1    66   30.0 
2025-11-11 00:00 UT   23 55 46.6   +00 39 37     2.099    2.842  130.3   15.4    66   30.0 
2025-11-12 00:00 UT   23 55 16.0   +00 42 50     2.108    2.839  129.1   15.7    66   30.0 
2025-11-13 00:00 UT   23 54 47.0   +00 45 53     2.117    2.835  128.0   16.0    66   30.0 
2025-11-14 00:00 UT   23 54 19.6   +00 48 46     2.125    2.832  126.9   16.2    66   30.1 
2025-11-15 00:00 UT   23 53 53.8   +00 51 28     2.134    2.829  125.7   16.5    66   30.1 

    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.