| Parameter |
Value |
| Designation |
C/2010 D4 (WISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-03-30T22:23:21.324480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:40Z |
| Obs used |
113 |
| NEO |
- |
| M1 |
11.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-04-12.0000000 |
| e |
0.88945973 |
| q (au) |
7.148209 |
| a (au) |
64.666104 |
| i (deg) |
105.659652 |
| Ω (om, deg) |
266.783514 |
| ω (w, deg) |
44.489319 |
| M (ma, deg) |
0.714674 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.542 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.542 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.818 |
| k |
0.800 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:03:47.18 |
+30:46:59.2 |
HIP 28715 |
32.73 |
| 2026-09-20 12:00 |
06:03:47.23 |
+30:46:59.6 |
HIP 28715 |
32.72 |
| 2026-09-21 00:00 |
06:03:47.24 |
+30:47:00.1 |
HIP 28715 |
32.71 |
| 2026-09-21 12:00 |
06:03:47.21 |
+30:47:00.6 |
HIP 28715 |
32.71 |
| 2026-09-22 00:00 |
06:03:47.15 |
+30:47:01.1 |
HIP 28715 |
32.70 |
| 2026-09-22 12:00 |
06:03:47.04 |
+30:47:01.6 |
HIP 28715 |
32.69 |
| 2026-09-23 00:00 |
06:03:46.89 |
+30:47:02.2 |
HIP 28715 |
32.68 |
| 2026-09-23 12:00 |
06:03:46.70 |
+30:47:02.7 |
HIP 28715 |
32.68 |
| 2026-09-24 00:00 |
06:03:46.48 |
+30:47:03.2 |
HIP 28715 |
32.67 |
| 2026-09-24 12:00 |
06:03:46.21 |
+30:47:03.7 |
HIP 28715 |
32.66 |
| 2026-09-25 00:00 |
06:03:45.90 |
+30:47:04.3 |
HIP 28715 |
32.66 |
| 2026-09-25 12:00 |
06:03:45.56 |
+30:47:04.8 |
HIP 28715 |
32.65 |
| 2026-09-26 00:00 |
06:03:45.17 |
+30:47:05.3 |
HIP 28715 |
32.65 |
| 2026-09-26 12:00 |
06:03:44.75 |
+30:47:05.9 |
HIP 28715 |
32.64 |
| 2026-09-27 00:00 |
06:03:44.28 |
+30:47:06.4 |
HIP 28715 |
32.64 |
| 2026-09-27 12:00 |
06:03:43.78 |
+30:47:07.0 |
HIP 28715 |
32.64 |
| 2026-09-28 00:00 |
06:03:43.24 |
+30:47:07.5 |
HIP 28715 |
32.64 |
| 2026-09-28 12:00 |
06:03:42.65 |
+30:47:08.0 |
HIP 28715 |
32.64 |
| 2026-09-29 00:00 |
06:03:42.03 |
+30:47:08.6 |
HIP 28715 |
32.64 |
| 2026-09-29 12:00 |
06:03:41.36 |
+30:47:09.1 |
HIP 28715 |
32.64 |
| 2026-09-30 00:00 |
06:03:40.66 |
+30:47:09.6 |
HIP 28715 |
32.65 |
| 2026-09-30 12:00 |
06:03:39.92 |
+30:47:10.2 |
HIP 28715 |
32.65 |
| 2026-10-01 00:00 |
06:03:39.13 |
+30:47:10.7 |
HIP 28715 |
32.66 |
| 2026-10-01 12:00 |
06:03:38.31 |
+30:47:11.2 |
HIP 28715 |
32.67 |
| 2026-10-02 00:00 |
06:03:37.45 |
+30:47:11.7 |
HIP 28715 |
32.68 |
| 2026-10-02 12:00 |
06:03:36.54 |
+30:47:12.2 |
HIP 28715 |
32.69 |
| 2026-10-03 00:00 |
06:03:35.60 |
+30:47:12.7 |
HIP 28715 |
32.70 |
| 2026-10-03 12:00 |
06:03:34.62 |
+30:47:13.2 |
HIP 28715 |
32.72 |
| 2026-10-04 00:00 |
06:03:33.59 |
+30:47:13.7 |
HIP 28715 |
32.74 |
| 2026-10-04 12:00 |
06:03:32.53 |
+30:47:14.2 |
HIP 28715 |
32.76 |
| 2026-10-05 00:00 |
06:03:31.42 |
+30:47:14.7 |
HIP 28715 |
32.79 |
| 2026-10-05 12:00 |
06:03:30.28 |
+30:47:15.1 |
HIP 28715 |
32.82 |
| 2026-10-06 00:00 |
06:03:29.10 |
+30:47:15.6 |
HIP 28715 |
32.85 |
| 2026-10-06 12:00 |
06:03:27.87 |
+30:47:16.0 |
HIP 28715 |
32.89 |
| 2026-10-07 00:00 |
06:03:26.61 |
+30:47:16.5 |
HIP 28517 |
32.81 |
| 2026-10-07 12:00 |
06:03:25.30 |
+30:47:16.9 |
HIP 28517 |
32.56 |
| 2026-10-08 00:00 |
06:03:23.96 |
+30:47:17.3 |
HIP 28517 |
32.30 |
| 2026-10-08 12:00 |
06:03:22.58 |
+30:47:17.7 |
HIP 28517 |
32.04 |
| 2026-10-09 00:00 |
06:03:21.15 |
+30:47:18.1 |
HIP 28517 |
31.76 |
| 2026-10-09 12:00 |
06:03:19.69 |
+30:47:18.4 |
HIP 28517 |
31.48 |
| 2026-10-10 00:00 |
06:03:18.18 |
+30:47:18.8 |
HIP 28517 |
31.19 |
| 2026-10-10 12:00 |
06:03:16.64 |
+30:47:19.1 |
HIP 28517 |
30.90 |
| 2026-10-11 00:00 |
06:03:15.06 |
+30:47:19.4 |
HIP 28517 |
30.60 |