| Parameter |
Value |
| Designation |
444P/WISE-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-07-10T08:57:56.568960Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T17:30:16Z |
| Obs used |
247 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
9.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-06-09T02:52:48.864000Z |
| Discovery magnitude (MPC) |
- |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-03-11.0000000 |
| e |
0.57029119 |
| q (au) |
1.473180 |
| a (au) |
3.428321 |
| i (deg) |
22.124438 |
| Ω (om, deg) |
89.406707 |
| ω (w, deg) |
170.888063 |
| M (ma, deg) |
341.154570 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.117 + 4.549\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.117 |
| n |
4.549 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.943 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
06:51:34.77 |
+26:01:02.6 |
HIP 32873 |
10.69 |
| 2026-07-29 12:00 |
06:52:00.69 |
+26:01:11.1 |
HIP 32873 |
15.51 |
| 2026-07-30 00:00 |
06:52:26.57 |
+26:01:19.5 |
HIP 33027 |
16.67 |
| 2026-07-30 12:00 |
06:52:52.41 |
+26:01:27.8 |
HIP 33027 |
15.61 |
| 2026-07-31 00:00 |
06:53:18.22 |
+26:01:36.1 |
HIP 33027 |
16.63 |
| 2026-07-31 12:00 |
06:53:43.99 |
+26:01:44.3 |
HIP 33027 |
19.42 |
| 2026-08-01 00:00 |
06:54:09.72 |
+26:01:52.5 |
HIP 33027 |
23.33 |
| 2026-08-01 12:00 |
06:54:35.41 |
+26:02:00.6 |
HIP 33356 |
23.01 |
| 2026-08-02 00:00 |
06:55:01.07 |
+26:02:08.6 |
HIP 33356 |
17.42 |
| 2026-08-02 12:00 |
06:55:26.68 |
+26:02:16.6 |
HIP 33356 |
12.01 |
| 2026-08-03 00:00 |
06:55:52.25 |
+26:02:24.6 |
HIP 33356 |
7.17 |
| 2026-08-03 12:00 |
06:56:17.78 |
+26:02:32.5 |
HIP 33356 |
4.97 |
| 2026-08-04 00:00 |
06:56:43.27 |
+26:02:40.4 |
HIP 33356 |
7.98 |
| 2026-08-04 12:00 |
06:57:08.71 |
+26:02:48.3 |
HIP 33356 |
12.96 |
| 2026-08-05 00:00 |
06:57:34.11 |
+26:02:56.1 |
HIP 33595 |
16.59 |
| 2026-08-05 12:00 |
06:57:59.47 |
+26:03:03.9 |
HIP 33595 |
10.94 |
| 2026-08-06 00:00 |
06:58:24.78 |
+26:03:11.7 |
HIP 33595 |
5.37 |
| 2026-08-06 12:00 |
06:58:50.05 |
+26:03:19.5 |
HIP 33595 |
1.63 |
| 2026-08-07 00:00 |
06:59:15.27 |
+26:03:27.2 |
HIP 33595 |
6.39 |
| 2026-08-07 12:00 |
06:59:40.44 |
+26:03:34.9 |
HIP 33650 |
9.17 |
| 2026-08-08 00:00 |
07:00:05.56 |
+26:03:42.7 |
HIP 33650 |
12.25 |
| 2026-08-08 12:00 |
07:00:30.63 |
+26:03:50.4 |
HIP 33793 |
12.32 |
| 2026-08-09 00:00 |
07:00:55.65 |
+26:03:58.1 |
HIP 33793 |
10.13 |
| 2026-08-09 12:00 |
07:01:20.62 |
+26:04:05.8 |
HIP 33793 |
10.79 |
| 2026-08-10 00:00 |
07:01:45.54 |
+26:04:13.5 |
HIP 33793 |
13.89 |
| 2026-08-10 12:00 |
07:02:10.40 |
+26:04:21.3 |
HIP 33831 |
16.93 |
| 2026-08-11 00:00 |
07:02:35.21 |
+26:04:29.1 |
HIP 33831 |
20.74 |
| 2026-08-11 12:00 |
07:02:59.96 |
+26:04:36.8 |
HIP 33831 |
25.20 |
| 2026-08-12 00:00 |
07:03:24.66 |
+26:04:44.6 |
HIP 33831 |
30.02 |
| 2026-08-12 12:00 |
07:03:49.30 |
+26:04:52.5 |
HIP 33831 |
35.04 |
| 2026-08-13 00:00 |
07:04:13.89 |
+26:05:00.4 |
HIP 34061 |
40.06 |
| 2026-08-13 12:00 |
07:04:38.41 |
+26:05:08.3 |
HIP 34061 |
41.16 |
| 2026-08-14 00:00 |
07:05:02.88 |
+26:05:16.2 |
HIP 34061 |
42.93 |
| 2026-08-14 12:00 |
07:05:27.28 |
+26:05:24.2 |
HIP 34061 |
45.31 |
| 2026-08-15 00:00 |
07:05:51.62 |
+26:05:32.3 |
HIP 34061 |
48.20 |
| 2026-08-15 12:00 |
07:06:15.90 |
+26:05:40.4 |
HIP 34487 |
46.98 |
| 2026-08-16 00:00 |
07:06:40.12 |
+26:05:48.6 |
HIP 34487 |
43.08 |
| 2026-08-16 12:00 |
07:07:04.27 |
+26:05:56.8 |
HIP 34487 |
39.54 |
| 2026-08-17 00:00 |
07:07:28.36 |
+26:06:05.1 |
HIP 34567 |
36.28 |
| 2026-08-17 12:00 |
07:07:52.38 |
+26:06:13.5 |
HIP 34567 |
32.29 |
| 2026-08-18 00:00 |
07:08:16.34 |
+26:06:21.9 |
HIP 34567 |
28.78 |
| 2026-08-18 12:00 |
07:08:40.23 |
+26:06:30.5 |
HIP 34567 |
25.93 |
| 2026-08-19 00:00 |
07:09:04.05 |
+26:06:39.1 |
HIP 34567 |
23.97 |