| Parameter |
Value |
| Designation |
504P/WISE-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-04-08T22:54:56.698560Z |
| Orbit solution date (soln_date, UTC) |
2025-08-01T17:26:05Z |
| Obs used |
411 |
| NEO |
- |
| M1 |
4.900 |
| K1 |
35.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2010-06-14T16:55:15.628800Z |
| Discovery magnitude (MPC) |
- |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-11-02.0000000 |
| e |
0.40602522 |
| q (au) |
2.224152 |
| a (au) |
3.744523 |
| i (deg) |
8.806861 |
| Ω (om, deg) |
221.121771 |
| ω (w, deg) |
308.496922 |
| M (ma, deg) |
338.514665 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.142 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.142 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
18:46:24.99 |
-16:59:01.5 |
HIP 92246 |
25.74 |
| 2026-03-26 12:00 |
18:46:46.80 |
-16:57:11.8 |
HIP 92246 |
20.31 |
| 2026-03-27 00:00 |
18:47:08.34 |
-16:55:21.8 |
HIP 92246 |
15.00 |
| 2026-03-27 12:00 |
18:47:29.62 |
-16:53:31.8 |
HIP 92246 |
9.91 |
| 2026-03-28 00:00 |
18:47:50.64 |
-16:51:41.5 |
HIP 92246 |
5.50 |
| 2026-03-28 12:00 |
18:48:11.40 |
-16:49:51.2 |
HIP 92246 |
4.39 |
| 2026-03-29 00:00 |
18:48:31.89 |
-16:48:00.7 |
HIP 92246 |
7.96 |
| 2026-03-29 12:00 |
18:48:52.11 |
-16:46:10.0 |
HIP 92370 |
9.17 |
| 2026-03-30 00:00 |
18:49:12.07 |
-16:44:19.3 |
HIP 92370 |
4.07 |
| 2026-03-30 12:00 |
18:49:31.76 |
-16:42:28.4 |
HIP 92370 |
1.18 |
| 2026-03-31 00:00 |
18:49:51.18 |
-16:40:37.5 |
HIP 92370 |
6.07 |
| 2026-03-31 12:00 |
18:50:10.32 |
-16:38:46.4 |
HIP 92370 |
11.01 |
| 2026-04-01 00:00 |
18:50:29.20 |
-16:36:55.3 |
HIP 92370 |
15.89 |
| 2026-04-01 12:00 |
18:50:47.80 |
-16:35:04.1 |
HIP 92572 |
15.73 |
| 2026-04-02 00:00 |
18:51:06.13 |
-16:33:12.8 |
HIP 92572 |
11.01 |
| 2026-04-02 12:00 |
18:51:24.19 |
-16:31:21.5 |
HIP 92572 |
6.41 |
| 2026-04-03 00:00 |
18:51:41.97 |
-16:29:30.1 |
HIP 92572 |
2.39 |
| 2026-04-03 12:00 |
18:51:59.47 |
-16:27:38.7 |
HIP 92572 |
3.64 |
| 2026-04-04 00:00 |
18:52:16.69 |
-16:25:47.2 |
HIP 92572 |
7.88 |
| 2026-04-04 12:00 |
18:52:33.64 |
-16:23:55.7 |
HIP 92671 |
6.51 |
| 2026-04-05 00:00 |
18:52:50.30 |
-16:22:04.2 |
HIP 92671 |
2.57 |
| 2026-04-05 12:00 |
18:53:06.68 |
-16:20:12.7 |
HIP 92671 |
3.07 |
| 2026-04-06 00:00 |
18:53:22.78 |
-16:18:21.2 |
HIP 92671 |
7.02 |
| 2026-04-06 12:00 |
18:53:38.59 |
-16:16:29.8 |
HIP 92671 |
11.16 |
| 2026-04-07 00:00 |
18:53:54.12 |
-16:14:38.3 |
HIP 92671 |
15.29 |
| 2026-04-07 12:00 |
18:54:09.36 |
-16:12:46.9 |
HIP 92671 |
19.38 |
| 2026-04-08 00:00 |
18:54:24.31 |
-16:10:55.5 |
HIP 92882 |
19.80 |
| 2026-04-08 12:00 |
18:54:38.98 |
-16:09:04.2 |
HIP 92882 |
18.39 |
| 2026-04-09 00:00 |
18:54:53.35 |
-16:07:12.9 |
HIP 92882 |
17.82 |
| 2026-04-09 12:00 |
18:55:07.43 |
-16:05:21.7 |
HIP 92900 |
17.97 |
| 2026-04-10 00:00 |
18:55:21.22 |
-16:03:30.5 |
HIP 92900 |
18.33 |
| 2026-04-10 12:00 |
18:55:34.72 |
-16:01:39.5 |
HIP 92852 |
17.40 |
| 2026-04-11 00:00 |
18:55:47.92 |
-15:59:48.6 |
HIP 92852 |
16.87 |
| 2026-04-11 12:00 |
18:56:00.82 |
-15:57:57.7 |
HIP 92852 |
17.08 |
| 2026-04-12 00:00 |
18:56:13.43 |
-15:56:07.0 |
HIP 92852 |
17.98 |
| 2026-04-12 12:00 |
18:56:25.74 |
-15:54:16.4 |
HIP 92852 |
19.43 |
| 2026-04-13 00:00 |
18:56:37.75 |
-15:52:26.0 |
HIP 92852 |
21.29 |
| 2026-04-13 12:00 |
18:56:49.45 |
-15:50:35.6 |
HIP 92852 |
23.44 |
| 2026-04-14 00:00 |
18:57:00.86 |
-15:48:45.5 |
HIP 92852 |
25.77 |
| 2026-04-14 12:00 |
18:57:11.96 |
-15:46:55.5 |
HIP 93202 |
27.70 |
| 2026-04-15 00:00 |
18:57:22.76 |
-15:45:05.7 |
HIP 93202 |
25.55 |
| 2026-04-15 12:00 |
18:57:33.25 |
-15:43:16.1 |
HIP 93202 |
23.70 |
| 2026-04-16 00:00 |
18:57:43.44 |
-15:41:26.7 |
HIP 93202 |
22.20 |