2015 HU171
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	5 Oct 2026	28.6	3.028 AU	2.272 AU	03h54m	+16°19'	131.4°	14.3°

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 2015 HU171 are:

            e (Eccentricity)                : 0.5774494
            a (Semimajor axis)              : 2.2893217
            i (Inclination)                 : 5.60635
            Ω (Longitude of ascending node) : 76.85884
            ω (Argument of perihelion)      : 179.35137
            M (Mean anomaly)                : 62.98241
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 76.21331
            B (Latitude of perihelion)      : 0.06337
            P (Orbital period in years)     : 3.46            
        

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
2026-10-05 00:00 UT   03 54 15.6   +16 19 18     2.272    3.028  131.4   14.3   261   28.6 
2026-10-05 20:01 UT   03 53 45.0   +16 17 38     2.267    3.032  132.3   14.1   262   28.6 
2026-10-06 00:00 UT   03 53 38.8   +16 17 17     2.266    3.032  132.5   14.1   262   28.6 
2026-10-07 00:00 UT   03 53 00.5   +16 15 12     2.259    3.037  133.7   13.8   262   28.6 
2026-10-08 00:00 UT   03 52 20.6   +16 13 03     2.252    3.041  134.8   13.5   262   28.6 
2026-10-09 00:00 UT   03 51 39.3   +16 10 50     2.246    3.045  136.0   13.2   262   28.6 
2026-10-10 00:00 UT   03 50 56.5   +16 08 33     2.240    3.049  137.1   12.9   262   28.5 
2026-10-11 00:00 UT   03 50 12.2   +16 06 12     2.234    3.053  138.3   12.6   262   28.5 
2026-10-12 00:00 UT   03 49 26.5   +16 03 47     2.228    3.057  139.5   12.3   262   28.5 
2026-10-13 00:00 UT   03 48 39.4   +16 01 19     2.223    3.061  140.6   11.9   262   28.5 
2026-10-14 00:00 UT   03 47 50.9   +15 58 47     2.218    3.065  141.8   11.6   262   28.5 
2026-10-15 00:00 UT   03 47 01.1   +15 56 12     2.213    3.069  143.0   11.3   263   28.5 
2026-10-16 00:00 UT   03 46 10.0   +15 53 33     2.208    3.073  144.2   10.9   263   28.5 
2026-10-17 00:00 UT   03 45 17.6   +15 50 50     2.204    3.077  145.4   10.6   263   28.4 
2026-10-18 00:00 UT   03 44 24.0   +15 48 05     2.199    3.081  146.6   10.3   263   28.4 
2026-10-19 00:00 UT   03 43 29.1   +15 45 16     2.195    3.084  147.8    9.9   263   28.4 
2026-10-20 00:00 UT   03 42 33.2   +15 42 24     2.192    3.088  149.0    9.6   263   28.4 
2026-10-21 00:00 UT   03 41 36.1   +15 39 29     2.188    3.092  150.2    9.2   264   28.4 
2026-10-22 00:00 UT   03 40 37.9   +15 36 31     2.185    3.096  151.5    8.8   264   28.4 
2026-10-23 00:00 UT   03 39 38.7   +15 33 30     2.182    3.100  152.7    8.5   264   28.4 
2026-10-24 00:00 UT   03 38 38.6   +15 30 26     2.179    3.104  153.9    8.1   265   28.3 
2026-10-25 00:00 UT   03 37 37.5   +15 27 20     2.177    3.107  155.2    7.7   265   28.3 
2026-10-26 00:00 UT   03 36 35.5   +15 24 12     2.175    3.111  156.4    7.4   265   28.3 
2026-10-27 00:00 UT   03 35 32.7   +15 21 01     2.173    3.115  157.6    7.0   266   28.3 
2026-10-28 00:00 UT   03 34 29.1   +15 17 48     2.171    3.119  158.9    6.6   266   28.3 
2026-10-29 00:00 UT   03 33 24.8   +15 14 32     2.170    3.123  160.1    6.2   267   28.3 
2026-10-30 00:00 UT   03 32 19.7   +15 11 15     2.169    3.126  161.3    5.8   268   28.2 
2026-10-31 00:00 UT   03 31 14.1   +15 07 57     2.168    3.130  162.6    5.4   268   28.2 
2026-11-01 00:00 UT   03 30 07.9   +15 04 36     2.168    3.134  163.8    5.1   269   28.2 
2026-11-02 00:00 UT   03 29 01.1   +15 01 14     2.168    3.137  165.1    4.7   270   28.2 
2026-11-03 00:00 UT   03 27 53.9   +14 57 51     2.168    3.141  166.3    4.3   271   28.2 
2026-11-04 00:00 UT   03 26 46.3   +14 54 27     2.169    3.145  167.5    3.9   273   28.1 

    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.