2021 SM3
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	4 Nov 2025	25.7	1.253 AU	2.179 AU	13h38m	-08°34'	15.6°	12.3°

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 SM3 are:

            e (Eccentricity)                : 0.4801960
            a (Semimajor axis)              : 1.5059573
            i (Inclination)                 : 16.06139
            Ω (Longitude of ascending node) : 23.08474
            ω (Argument of perihelion)      : 71.20389
            M (Mean anomaly)                : 52.81330
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 93.58176
            B (Latitude of perihelion)      : 15.18359
            P (Orbital period in years)     : 1.85            
        

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
2025-11-04 00:00 UT   13 38 26.0   -08 34 12     2.179    1.253   15.6   12.3   297   25.7 
2025-11-04 07:12 UT   13 39 14.9   -08 40 49     2.181    1.255   15.7   12.3   297   25.7 
2025-11-05 00:00 UT   13 41 08.6   -08 56 12     2.185    1.261   15.8   12.4   296   25.7 
2025-11-06 00:00 UT   13 43 50.5   -09 17 59     2.190    1.268   16.1   12.5   296   25.7 
2025-11-07 00:00 UT   13 46 31.6   -09 39 33     2.196    1.276   16.3   12.6   295   25.8 
2025-11-08 00:00 UT   13 49 12.1   -10 00 55     2.201    1.283   16.6   12.7   295   25.8 
2025-11-09 00:00 UT   13 51 51.8   -10 22 04     2.206    1.291   16.8   12.9   294   25.8 
2025-11-10 00:00 UT   13 54 30.9   -10 43 01     2.211    1.298   17.1   13.0   294   25.8 
2025-11-11 00:00 UT   13 57 09.4   -11 03 45     2.216    1.306   17.4   13.1   293   25.9 
2025-11-12 00:00 UT   13 59 47.2   -11 24 16     2.221    1.313   17.7   13.2   293   25.9 
2025-11-13 00:00 UT   14 02 24.4   -11 44 35     2.226    1.320   17.9   13.4   292   25.9 
2025-11-14 00:00 UT   14 05 01.1   -12 04 42     2.231    1.328   18.2   13.5   292   25.9 
2025-11-15 00:00 UT   14 07 37.1   -12 24 36     2.236    1.335   18.5   13.6   291   25.9 

    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.