504P/WISE-PANSTARRS
| 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) |
| 2026-02-03 00:00 |
17:49:56.24 |
-19:24:51.4 |
HIP 87410 |
27.28 |
| 2026-02-03 12:00 |
17:50:38.71 |
-19:24:02.4 |
HIP 87410 |
18.07 |
| 2026-02-04 00:00 |
17:51:21.03 |
-19:23:12.4 |
HIP 87410 |
10.52 |
| 2026-02-04 12:00 |
17:52:03.21 |
-19:22:21.4 |
HIP 87410 |
9.78 |
| 2026-02-05 00:00 |
17:52:45.24 |
-19:21:29.6 |
HIP 87410 |
16.70 |
| 2026-02-05 12:00 |
17:53:27.11 |
-19:20:36.8 |
HIP 87410 |
25.67 |
| 2026-02-06 00:00 |
17:54:08.84 |
-19:19:43.0 |
HIP 87568 |
29.33 |
| 2026-02-06 12:00 |
17:54:50.42 |
-19:18:48.4 |
HIP 87832 |
30.37 |
| 2026-02-07 00:00 |
17:55:31.84 |
-19:17:52.8 |
HIP 87832 |
22.44 |
| 2026-02-07 12:00 |
17:56:13.11 |
-19:16:56.3 |
HIP 87832 |
16.66 |
| 2026-02-08 00:00 |
17:56:54.23 |
-19:15:58.9 |
HIP 87881 |
15.24 |
| 2026-02-08 12:00 |
17:57:35.19 |
-19:15:00.6 |
HIP 87881 |
15.40 |
| 2026-02-09 00:00 |
17:58:15.99 |
-19:14:01.4 |
HIP 87881 |
20.72 |
| 2026-02-09 12:00 |
17:58:56.63 |
-19:13:01.3 |
HIP 88073 |
19.94 |
| 2026-02-10 00:00 |
17:59:37.12 |
-19:12:00.3 |
HIP 88167 |
11.39 |
| 2026-02-10 12:00 |
18:00:17.45 |
-19:10:58.4 |
HIP 88167 |
3.36 |
| 2026-02-11 00:00 |
18:00:57.61 |
-19:09:55.7 |
HIP 88167 |
8.70 |
| 2026-02-11 12:00 |
18:01:37.61 |
-19:08:52.1 |
HIP 88297 |
4.27 |
| 2026-02-12 00:00 |
18:02:17.45 |
-19:07:47.6 |
HIP 88341 |
3.66 |
| 2026-02-12 12:00 |
18:02:57.12 |
-19:06:42.3 |
HIP 88341 |
7.76 |
| 2026-02-13 00:00 |
18:03:36.63 |
-19:05:36.2 |
HIP 88341 |
16.84 |
| 2026-02-13 12:00 |
18:04:15.97 |
-19:04:29.2 |
HIP 88341 |
26.12 |
| 2026-02-14 00:00 |
18:04:55.14 |
-19:03:21.3 |
HIP 88704 |
22.69 |
| 2026-02-14 12:00 |
18:05:34.14 |
-19:02:12.7 |
HIP 88704 |
13.59 |
| 2026-02-15 00:00 |
18:06:12.97 |
-19:01:03.2 |
HIP 88704 |
5.23 |
| 2026-02-15 12:00 |
18:06:51.63 |
-18:59:52.9 |
HIP 88718 |
2.25 |
| 2026-02-16 00:00 |
18:07:30.11 |
-18:58:41.8 |
HIP 88762 |
5.97 |
| 2026-02-16 12:00 |
18:08:08.42 |
-18:57:29.9 |
HIP 88762 |
13.50 |
| 2026-02-17 00:00 |
18:08:46.56 |
-18:56:17.3 |
HIP 88982 |
14.80 |
| 2026-02-17 12:00 |
18:09:24.51 |
-18:55:03.8 |
HIP 88982 |
6.45 |
| 2026-02-18 00:00 |
18:10:02.29 |
-18:53:49.5 |
HIP 88982 |
5.28 |
| 2026-02-18 12:00 |
18:10:39.89 |
-18:52:34.5 |
HIP 88982 |
13.26 |
| 2026-02-19 00:00 |
18:11:17.31 |
-18:51:18.8 |
HIP 89061 |
20.86 |
| 2026-02-19 12:00 |
18:11:54.55 |
-18:50:02.2 |
HIP 89061 |
26.91 |
| 2026-02-20 00:00 |
18:12:31.61 |
-18:48:44.9 |
HIP 89272 |
26.47 |
| 2026-02-20 12:00 |
18:13:08.48 |
-18:47:26.9 |
HIP 89272 |
26.83 |
| 2026-02-21 00:00 |
18:13:45.16 |
-18:46:08.2 |
HIP 89470 |
25.82 |
| 2026-02-21 12:00 |
18:14:21.66 |
-18:44:48.7 |
HIP 89470 |
17.14 |
| 2026-02-22 00:00 |
18:14:57.98 |
-18:43:28.5 |
HIP 89470 |
8.64 |
| 2026-02-22 12:00 |
18:15:34.10 |
-18:42:07.7 |
HIP 89470 |
2.56 |
| 2026-02-23 00:00 |
18:16:10.04 |
-18:40:46.1 |
HIP 89529 |
3.80 |
| 2026-02-23 12:00 |
18:16:45.78 |
-18:39:23.8 |
HIP 89529 |
9.54 |
| 2026-02-24 00:00 |
18:17:21.34 |
-18:38:00.8 |
HIP 89630 |
10.35 |