| 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) |
| 2026-05-12 00:00 |
18:59:20.60 |
-14:14:54.2 |
HIP 93235 |
9.65 |
| 2026-05-12 12:00 |
18:59:14.09 |
-14:13:27.9 |
HIP 93235 |
8.74 |
| 2026-05-13 00:00 |
18:59:07.28 |
-14:12:02.3 |
HIP 93235 |
8.34 |
| 2026-05-13 12:00 |
18:59:00.15 |
-14:10:37.4 |
HIP 93235 |
8.57 |
| 2026-05-14 00:00 |
18:58:52.71 |
-14:09:13.1 |
HIP 93235 |
9.42 |
| 2026-05-14 12:00 |
18:58:44.97 |
-14:07:49.5 |
HIP 93235 |
10.78 |
| 2026-05-15 00:00 |
18:58:36.92 |
-14:06:26.7 |
HIP 93235 |
12.50 |
| 2026-05-15 12:00 |
18:58:28.56 |
-14:05:04.5 |
HIP 93235 |
14.49 |
| 2026-05-16 00:00 |
18:58:19.90 |
-14:03:43.0 |
HIP 93235 |
16.68 |
| 2026-05-16 12:00 |
18:58:10.93 |
-14:02:22.3 |
HIP 93235 |
19.01 |
| 2026-05-17 00:00 |
18:58:01.67 |
-14:01:02.2 |
HIP 93004 |
18.07 |
| 2026-05-17 12:00 |
18:57:52.10 |
-13:59:43.0 |
HIP 93004 |
15.87 |
| 2026-05-18 00:00 |
18:57:42.24 |
-13:58:24.4 |
HIP 93004 |
13.75 |
| 2026-05-18 12:00 |
18:57:32.08 |
-13:57:06.6 |
HIP 93004 |
11.81 |
| 2026-05-19 00:00 |
18:57:21.62 |
-13:55:49.6 |
HIP 93004 |
10.20 |
| 2026-05-19 12:00 |
18:57:10.88 |
-13:54:33.3 |
HIP 93004 |
9.15 |
| 2026-05-20 00:00 |
18:56:59.84 |
-13:53:17.8 |
HIP 93004 |
8.93 |
| 2026-05-20 12:00 |
18:56:48.52 |
-13:52:03.0 |
HIP 93004 |
9.63 |
| 2026-05-21 00:00 |
18:56:36.91 |
-13:50:49.0 |
HIP 93004 |
11.14 |
| 2026-05-21 12:00 |
18:56:25.01 |
-13:49:35.8 |
HIP 93004 |
13.23 |
| 2026-05-22 00:00 |
18:56:12.84 |
-13:48:23.4 |
HIP 93004 |
15.69 |
| 2026-05-22 12:00 |
18:56:00.39 |
-13:47:11.8 |
HIP 93004 |
18.40 |
| 2026-05-23 00:00 |
18:55:47.66 |
-13:46:01.0 |
HIP 93004 |
21.31 |
| 2026-05-23 12:00 |
18:55:34.66 |
-13:44:51.0 |
HIP 92763 |
21.61 |
| 2026-05-24 00:00 |
18:55:21.38 |
-13:43:41.8 |
HIP 92763 |
18.19 |
| 2026-05-24 12:00 |
18:55:07.84 |
-13:42:33.4 |
HIP 92763 |
14.71 |
| 2026-05-25 00:00 |
18:54:54.03 |
-13:41:25.8 |
HIP 92763 |
11.17 |
| 2026-05-25 12:00 |
18:54:39.95 |
-13:40:19.0 |
HIP 92763 |
7.58 |
| 2026-05-26 00:00 |
18:54:25.62 |
-13:39:13.1 |
HIP 92763 |
3.94 |
| 2026-05-26 12:00 |
18:54:11.02 |
-13:38:07.9 |
HIP 92763 |
0.56 |
| 2026-05-27 00:00 |
18:53:56.17 |
-13:37:03.7 |
HIP 92763 |
3.61 |
| 2026-05-27 12:00 |
18:53:41.07 |
-13:36:00.2 |
HIP 92763 |
7.41 |
| 2026-05-28 00:00 |
18:53:25.72 |
-13:34:57.6 |
HIP 92763 |
11.28 |
| 2026-05-28 12:00 |
18:53:10.12 |
-13:33:55.8 |
HIP 92763 |
15.21 |
| 2026-05-29 00:00 |
18:52:54.27 |
-13:32:54.9 |
HIP 92763 |
19.19 |
| 2026-05-29 12:00 |
18:52:38.18 |
-13:31:54.8 |
HIP 92763 |
23.23 |
| 2026-05-30 00:00 |
18:52:21.85 |
-13:30:55.6 |
HIP 92498 |
19.57 |
| 2026-05-30 12:00 |
18:52:05.29 |
-13:29:57.2 |
HIP 92498 |
15.43 |
| 2026-05-31 00:00 |
18:51:48.49 |
-13:28:59.7 |
HIP 92498 |
11.24 |
| 2026-05-31 12:00 |
18:51:31.46 |
-13:28:03.1 |
HIP 92498 |
6.99 |
| 2026-06-01 00:00 |
18:51:14.21 |
-13:27:07.3 |
HIP 92498 |
2.71 |
| 2026-06-01 12:00 |
18:50:56.73 |
-13:26:12.4 |
HIP 92498 |
1.68 |
| 2026-06-02 00:00 |
18:50:39.03 |
-13:25:18.4 |
HIP 92498 |
6.06 |