| Parameter |
Value |
| Designation |
245P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-02-04T19:10:49.661760Z |
| Orbit solution date (soln_date, UTC) |
2026-07-21T13:12:12Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-12-09.0000000 |
| e |
0.46796773 |
| q (au) |
2.133409 |
| a (au) |
4.009924 |
| i (deg) |
21.027918 |
| Ω (om, deg) |
318.114757 |
| ω (w, deg) |
316.650028 |
| M (ma, deg) |
82.508527 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
21:36:33.57 |
-15:37:51.4 |
HIP 106631 |
10.60 |
| 2026-07-29 12:00 |
21:36:03.07 |
-15:34:22.0 |
HIP 106631 |
7.82 |
| 2026-07-30 00:00 |
21:35:32.41 |
-15:30:52.8 |
HIP 106631 |
11.94 |
| 2026-07-30 12:00 |
21:35:01.60 |
-15:27:24.1 |
HIP 106631 |
18.92 |
| 2026-07-31 00:00 |
21:34:30.65 |
-15:23:55.6 |
HIP 106631 |
26.62 |
| 2026-07-31 12:00 |
21:33:59.58 |
-15:20:27.5 |
HIP 106354 |
31.68 |
| 2026-08-01 00:00 |
21:33:28.38 |
-15:16:59.8 |
HIP 106354 |
29.73 |
| 2026-08-01 12:00 |
21:32:57.07 |
-15:13:32.4 |
HIP 106354 |
30.01 |
| 2026-08-02 00:00 |
21:32:25.65 |
-15:10:05.4 |
HIP 106354 |
32.47 |
| 2026-08-02 12:00 |
21:31:54.14 |
-15:06:38.8 |
HIP 106139 |
28.46 |
| 2026-08-03 00:00 |
21:31:22.55 |
-15:03:12.5 |
HIP 106139 |
21.62 |
| 2026-08-03 12:00 |
21:30:50.88 |
-14:59:46.6 |
HIP 106139 |
16.25 |
| 2026-08-04 00:00 |
21:30:19.15 |
-14:56:21.1 |
HIP 106139 |
14.16 |
| 2026-08-04 12:00 |
21:29:47.36 |
-14:52:55.9 |
HIP 106050 |
14.25 |
| 2026-08-05 00:00 |
21:29:15.52 |
-14:49:31.2 |
HIP 106050 |
6.16 |
| 2026-08-05 12:00 |
21:28:43.64 |
-14:46:06.8 |
HIP 106050 |
3.79 |
| 2026-08-06 00:00 |
21:28:11.74 |
-14:42:42.8 |
HIP 105997 |
7.53 |
| 2026-08-06 12:00 |
21:27:39.82 |
-14:39:19.2 |
HIP 105997 |
12.14 |
| 2026-08-07 00:00 |
21:27:07.89 |
-14:35:56.0 |
HIP 105997 |
19.50 |
| 2026-08-07 12:00 |
21:26:35.96 |
-14:32:33.2 |
HIP 105782 |
23.44 |
| 2026-08-08 00:00 |
21:26:04.04 |
-14:29:10.8 |
HIP 105782 |
15.72 |
| 2026-08-08 12:00 |
21:25:32.15 |
-14:25:48.8 |
HIP 105782 |
9.34 |
| 2026-08-09 00:00 |
21:25:00.28 |
-14:22:27.3 |
HIP 105782 |
8.33 |
| 2026-08-09 12:00 |
21:24:28.46 |
-14:19:06.1 |
HIP 105782 |
13.89 |
| 2026-08-10 00:00 |
21:23:56.69 |
-14:15:45.4 |
HIP 105782 |
21.39 |
| 2026-08-10 12:00 |
21:23:24.98 |
-14:12:25.0 |
HIP 105782 |
29.37 |
| 2026-08-11 00:00 |
21:22:53.34 |
-14:09:05.1 |
HIP 105782 |
37.50 |
| 2026-08-11 12:00 |
21:22:21.78 |
-14:05:45.6 |
HIP 105315 |
37.44 |
| 2026-08-12 00:00 |
21:21:50.31 |
-14:02:26.6 |
HIP 105315 |
29.55 |
| 2026-08-12 12:00 |
21:21:18.94 |
-13:59:07.9 |
HIP 105315 |
21.99 |
| 2026-08-13 00:00 |
21:20:47.69 |
-13:55:49.7 |
HIP 105315 |
15.25 |
| 2026-08-13 12:00 |
21:20:16.55 |
-13:52:31.9 |
HIP 105315 |
10.88 |
| 2026-08-14 00:00 |
21:19:45.54 |
-13:49:14.5 |
HIP 105315 |
11.83 |
| 2026-08-14 12:00 |
21:19:14.68 |
-13:45:57.6 |
HIP 105315 |
17.19 |
| 2026-08-15 00:00 |
21:18:43.96 |
-13:42:41.1 |
HIP 105315 |
24.16 |
| 2026-08-15 12:00 |
21:18:13.40 |
-13:39:25.0 |
HIP 105079 |
26.95 |
| 2026-08-16 00:00 |
21:17:43.01 |
-13:36:09.3 |
HIP 105079 |
20.70 |
| 2026-08-16 12:00 |
21:17:12.80 |
-13:32:54.1 |
HIP 105079 |
16.16 |
| 2026-08-17 00:00 |
21:16:42.76 |
-13:29:39.3 |
HIP 105079 |
14.93 |
| 2026-08-17 12:00 |
21:16:12.93 |
-13:26:25.0 |
HIP 105002 |
14.63 |
| 2026-08-18 00:00 |
21:15:43.29 |
-13:23:11.1 |
HIP 105002 |
11.73 |
| 2026-08-18 12:00 |
21:15:13.87 |
-13:19:57.7 |
HIP 105002 |
13.60 |
| 2026-08-19 00:00 |
21:14:44.66 |
-13:16:44.7 |
HIP 105002 |
18.81 |