A861 HC
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	11 Dec 2024	10.7	2.530 AU	1.562 AU	05h22m	+09°35'	166.4°	5.2°
Today	22 Jan 2025	11.4	2.496 AU	1.738 AU	04h56m	+10°11'	131.0°	17.3°

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 A861 HC are:

            e (Eccentricity)                : 0.1701533
            a (Semimajor axis)              : 2.9747967
            i (Inclination)                 : 8.59300
            Ω (Longitude of ascending node) : 184.98781
            ω (Argument of perihelion)      : 288.85367
            M (Mean anomaly)                : 171.79336
            Epoch                           : 2022 Aug 09

            L (Longitude of perihelion)     : 114.04017
            B (Latitude of perihelion)      : -8.12875
            P (Orbital period in years)     : 5.13            
        

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
2025-01-22 00:00 UT   04 56 37.7   +10 11 58     1.738    2.496  131.0   17.3    73   11.4 
2025-01-22 05:11 UT   04 56 36.0   +10 12 44     1.740    2.496  130.8   17.4    73   11.4 
2025-01-23 00:00 UT   04 56 30.4   +10 15 30     1.747    2.496  130.0   17.6    73   11.4 
2025-01-24 00:00 UT   04 56 24.8   +10 19 08     1.755    2.495  129.0   17.9    73   11.4 
2025-01-25 00:00 UT   04 56 20.9   +10 22 51     1.764    2.494  128.0   18.1    74   11.5 
2025-01-26 00:00 UT   04 56 18.8   +10 26 38     1.773    2.494  127.1   18.4    74   11.5 
2025-01-27 00:00 UT   04 56 18.4   +10 30 31     1.783    2.493  126.1   18.6    75   11.5 
2025-01-28 00:00 UT   04 56 19.8   +10 34 28     1.792    2.493  125.1   18.9    75   11.5 
2025-01-29 00:00 UT   04 56 23.0   +10 38 30     1.802    2.492  124.2   19.1    75   11.5 
2025-01-30 00:00 UT   04 56 27.8   +10 42 36     1.811    2.491  123.2   19.3    76   11.5 
2025-01-31 00:00 UT   04 56 34.5   +10 46 46     1.821    2.491  122.3   19.5    76   11.6 
2025-02-01 00:00 UT   04 56 42.8   +10 51 01     1.831    2.490  121.4   19.7    76   11.6 
2025-02-02 00:00 UT   04 56 52.9   +10 55 18     1.841    2.490  120.4   20.0    77   11.6 
2025-02-03 00:00 UT   04 57 04.8   +10 59 40     1.851    2.489  119.5   20.2    77   11.6 
2025-02-04 00:00 UT   04 57 18.3   +11 04 04     1.861    2.488  118.6   20.4    77   11.6 
2025-02-05 00:00 UT   04 57 33.5   +11 08 32     1.872    2.488  117.7   20.5    78   11.7 
2025-02-06 00:00 UT   04 57 50.4   +11 13 03     1.882    2.487  116.8   20.7    78   11.7 
2025-02-07 00:00 UT   04 58 09.0   +11 17 36     1.893    2.487  115.9   20.9    78   11.7 
2025-02-08 00:00 UT   04 58 29.3   +11 22 12     1.903    2.486  115.0   21.1    79   11.7 
2025-02-09 00:00 UT   04 58 51.1   +11 26 50     1.914    2.486  114.1   21.2    79   11.7 
2025-02-10 00:00 UT   04 59 14.7   +11 31 30     1.925    2.485  113.2   21.4    79   11.7 
2025-02-11 00:00 UT   04 59 39.8   +11 36 12     1.936    2.485  112.3   21.6    79   11.8 
2025-02-12 00:00 UT   05 00 06.5   +11 40 56     1.947    2.484  111.5   21.7    80   11.8 
2025-02-13 00:00 UT   05 00 34.7   +11 45 42     1.958    2.484  110.6   21.8    80   11.8 
2025-02-14 00:00 UT   05 01 04.6   +11 50 29     1.969    2.483  109.8   22.0    80   11.8 
2025-02-15 00:00 UT   05 01 36.0   +11 55 17     1.980    2.483  108.9   22.1    80   11.8 
2025-02-16 00:00 UT   05 02 08.9   +12 00 07     1.991    2.482  108.1   22.2    81   11.8 
2025-02-17 00:00 UT   05 02 43.3   +12 04 58     2.003    2.482  107.2   22.4    81   11.9 
2025-02-18 00:00 UT   05 03 19.2   +12 09 49     2.014    2.481  106.4   22.5    81   11.9 
2025-02-19 00:00 UT   05 03 56.6   +12 14 41     2.026    2.481  105.6   22.6    81   11.9 
2025-02-20 00:00 UT   05 04 35.4   +12 19 34     2.037    2.480  104.7   22.7    82   11.9 
2025-02-21 00:00 UT   05 05 15.7   +12 24 27     2.049    2.480  103.9   22.8    82   11.9 

    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.