| 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) |
| 2026-03-26 00:00 |
05:16:26.99 |
+24:00:04.2 |
HIP 24665 |
14.81 |
| 2026-03-26 12:00 |
05:16:38.59 |
+24:00:47.7 |
HIP 24665 |
12.15 |
| 2026-03-27 00:00 |
05:16:50.35 |
+24:01:31.2 |
HIP 24665 |
9.51 |
| 2026-03-27 12:00 |
05:17:02.28 |
+24:02:14.8 |
HIP 24665 |
6.94 |
| 2026-03-28 00:00 |
05:17:14.37 |
+24:02:58.4 |
HIP 24665 |
4.64 |
| 2026-03-28 12:00 |
05:17:26.62 |
+24:03:42.0 |
HIP 24665 |
3.32 |
| 2026-03-29 00:00 |
05:17:39.03 |
+24:04:25.6 |
HIP 24665 |
4.18 |
| 2026-03-29 12:00 |
05:17:51.60 |
+24:05:09.3 |
HIP 24665 |
6.43 |
| 2026-03-30 00:00 |
05:18:04.33 |
+24:05:53.0 |
HIP 24665 |
9.12 |
| 2026-03-30 12:00 |
05:18:17.22 |
+24:06:36.7 |
HIP 24665 |
11.99 |
| 2026-03-31 00:00 |
05:18:30.26 |
+24:07:20.5 |
HIP 24665 |
14.96 |
| 2026-03-31 12:00 |
05:18:43.46 |
+24:08:04.2 |
HIP 24665 |
17.99 |
| 2026-04-01 00:00 |
05:18:56.81 |
+24:08:48.0 |
HIP 24665 |
21.07 |
| 2026-04-01 12:00 |
05:19:10.32 |
+24:09:31.7 |
HIP 24875 |
19.59 |
| 2026-04-02 00:00 |
05:19:23.97 |
+24:10:15.5 |
HIP 24875 |
17.31 |
| 2026-04-02 12:00 |
05:19:37.78 |
+24:10:59.3 |
HIP 24875 |
15.35 |
| 2026-04-03 00:00 |
05:19:51.74 |
+24:11:43.1 |
HIP 24875 |
13.86 |
| 2026-04-03 12:00 |
05:20:05.85 |
+24:12:26.9 |
HIP 24875 |
13.05 |
| 2026-04-04 00:00 |
05:20:20.10 |
+24:13:10.7 |
HIP 24994 |
11.26 |
| 2026-04-04 12:00 |
05:20:34.51 |
+24:13:54.5 |
HIP 24994 |
8.00 |
| 2026-04-05 00:00 |
05:20:49.06 |
+24:14:38.3 |
HIP 24994 |
4.85 |
| 2026-04-05 12:00 |
05:21:03.75 |
+24:15:22.1 |
HIP 24994 |
2.44 |
| 2026-04-06 00:00 |
05:21:18.59 |
+24:16:05.9 |
HIP 24994 |
3.48 |
| 2026-04-06 12:00 |
05:21:33.58 |
+24:16:49.6 |
HIP 24994 |
6.52 |
| 2026-04-07 00:00 |
05:21:48.70 |
+24:17:33.4 |
HIP 24994 |
9.90 |
| 2026-04-07 12:00 |
05:22:03.97 |
+24:18:17.1 |
HIP 24994 |
13.38 |
| 2026-04-08 00:00 |
05:22:19.38 |
+24:19:00.8 |
HIP 24994 |
16.92 |
| 2026-04-08 12:00 |
05:22:34.93 |
+24:19:44.5 |
HIP 24994 |
20.51 |
| 2026-04-09 00:00 |
05:22:50.62 |
+24:20:28.1 |
HIP 24994 |
24.13 |
| 2026-04-09 12:00 |
05:23:06.45 |
+24:21:11.8 |
HIP 25306 |
27.48 |
| 2026-04-10 00:00 |
05:23:22.42 |
+24:21:55.4 |
HIP 25306 |
24.94 |
| 2026-04-10 12:00 |
05:23:38.52 |
+24:22:38.9 |
HIP 25306 |
22.70 |
| 2026-04-11 00:00 |
05:23:54.76 |
+24:23:22.5 |
HIP 25306 |
20.88 |
| 2026-04-11 12:00 |
05:24:11.13 |
+24:24:06.0 |
HIP 25306 |
19.61 |
| 2026-04-12 00:00 |
05:24:27.63 |
+24:24:49.4 |
HIP 25306 |
19.01 |
| 2026-04-12 12:00 |
05:24:44.27 |
+24:25:32.8 |
HIP 25306 |
19.18 |
| 2026-04-13 00:00 |
05:25:01.04 |
+24:26:16.2 |
HIP 25306 |
20.11 |
| 2026-04-13 12:00 |
05:25:17.95 |
+24:26:59.5 |
HIP 25306 |
21.71 |
| 2026-04-14 00:00 |
05:25:34.98 |
+24:27:42.8 |
HIP 25306 |
23.86 |
| 2026-04-14 12:00 |
05:25:52.14 |
+24:28:26.0 |
HIP 25498 |
23.69 |
| 2026-04-15 00:00 |
05:26:09.43 |
+24:29:09.2 |
HIP 25498 |
21.45 |
| 2026-04-15 12:00 |
05:26:26.85 |
+24:29:52.3 |
HIP 25498 |
19.76 |
| 2026-04-16 00:00 |
05:26:44.39 |
+24:30:35.3 |
HIP 25550 |
17.22 |