| Parameter |
Value |
| Designation |
245P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-02-04T12:53:48.733440Z |
| Orbit solution date (soln_date, UTC) |
2022-02-14T01:12:50Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-08-05.0000000 |
| e |
0.46614825 |
| q (au) |
2.139432 |
| a (au) |
4.007539 |
| i (deg) |
21.087839 |
| Ω (om, deg) |
318.527206 |
| ω (w, deg) |
316.399919 |
| M (ma, deg) |
337.451800 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.407 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.407 |
| n |
2.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:17:07.24 |
-33:41:58.0 |
HIP 100042 |
18.39 |
| 2026-03-26 12:00 |
20:18:09.99 |
-33:37:52.6 |
HIP 100042 |
21.22 |
| 2026-03-27 00:00 |
20:19:12.49 |
-33:33:46.0 |
HIP 100299 |
22.34 |
| 2026-03-27 12:00 |
20:20:14.73 |
-33:29:38.2 |
HIP 100299 |
11.41 |
| 2026-03-28 00:00 |
20:21:16.73 |
-33:25:29.2 |
HIP 100299 |
11.48 |
| 2026-03-28 12:00 |
20:22:18.48 |
-33:21:19.0 |
HIP 100299 |
22.38 |
| 2026-03-29 00:00 |
20:23:19.97 |
-33:17:07.7 |
HIP 100546 |
24.34 |
| 2026-03-29 12:00 |
20:24:21.21 |
-33:12:55.3 |
HIP 100728 |
14.77 |
| 2026-03-30 00:00 |
20:25:22.19 |
-33:08:41.7 |
HIP 100728 |
13.22 |
| 2026-03-30 12:00 |
20:26:22.92 |
-33:04:27.1 |
HIP 100814 |
13.94 |
| 2026-03-31 00:00 |
20:27:23.39 |
-33:00:11.3 |
HIP 100960 |
20.25 |
| 2026-03-31 12:00 |
20:28:23.60 |
-32:55:54.5 |
HIP 101106 |
17.34 |
| 2026-04-01 00:00 |
20:29:23.56 |
-32:51:36.6 |
HIP 101106 |
10.68 |
| 2026-04-01 12:00 |
20:30:23.25 |
-32:47:17.7 |
HIP 101106 |
16.74 |
| 2026-04-02 00:00 |
20:31:22.69 |
-32:42:57.8 |
HIP 101253 |
6.42 |
| 2026-04-02 12:00 |
20:32:21.86 |
-32:38:36.9 |
HIP 101253 |
11.76 |
| 2026-04-03 00:00 |
20:33:20.78 |
-32:34:15.0 |
HIP 101253 |
24.11 |
| 2026-04-03 12:00 |
20:34:19.42 |
-32:29:52.2 |
HIP 101656 |
26.88 |
| 2026-04-04 00:00 |
20:35:17.81 |
-32:25:28.3 |
HIP 101656 |
17.70 |
| 2026-04-04 12:00 |
20:36:15.93 |
-32:21:03.6 |
HIP 101693 |
10.59 |
| 2026-04-05 00:00 |
20:37:13.78 |
-32:16:37.9 |
HIP 101693 |
7.39 |
| 2026-04-05 12:00 |
20:38:11.36 |
-32:12:11.4 |
HIP 101693 |
18.27 |
| 2026-04-06 00:00 |
20:39:08.68 |
-32:07:43.9 |
HIP 101964 |
8.27 |
| 2026-04-06 12:00 |
20:40:05.72 |
-32:03:15.6 |
HIP 101964 |
5.85 |
| 2026-04-07 00:00 |
20:41:02.49 |
-31:58:46.5 |
HIP 101964 |
18.18 |
| 2026-04-07 12:00 |
20:41:58.99 |
-31:54:16.5 |
HIP 102107 |
16.64 |
| 2026-04-08 00:00 |
20:42:55.22 |
-31:49:45.7 |
HIP 102336 |
15.78 |
| 2026-04-08 12:00 |
20:43:51.17 |
-31:45:14.1 |
HIP 102336 |
10.82 |
| 2026-04-09 00:00 |
20:44:46.84 |
-31:40:41.8 |
HIP 102336 |
17.54 |
| 2026-04-09 12:00 |
20:45:42.24 |
-31:36:08.7 |
HIP 102409 |
17.24 |
| 2026-04-10 00:00 |
20:46:37.36 |
-31:31:34.8 |
HIP 102578 |
9.00 |
| 2026-04-10 12:00 |
20:47:32.20 |
-31:27:00.3 |
HIP 102578 |
3.77 |
| 2026-04-11 00:00 |
20:48:26.75 |
-31:22:25.0 |
HIP 102690 |
3.80 |
| 2026-04-11 12:00 |
20:49:21.02 |
-31:17:49.0 |
HIP 102690 |
14.13 |
| 2026-04-12 00:00 |
20:50:15.01 |
-31:13:12.4 |
HIP 102892 |
6.28 |
| 2026-04-12 12:00 |
20:51:08.71 |
-31:08:35.1 |
HIP 102892 |
9.19 |
| 2026-04-13 00:00 |
20:52:02.13 |
-31:03:57.2 |
HIP 102892 |
20.84 |
| 2026-04-13 12:00 |
20:52:55.26 |
-30:59:18.6 |
HIP 103103 |
17.39 |
| 2026-04-14 00:00 |
20:53:48.09 |
-30:54:39.5 |
HIP 103103 |
12.55 |
| 2026-04-14 12:00 |
20:54:40.64 |
-30:49:59.8 |
HIP 103297 |
12.89 |
| 2026-04-15 00:00 |
20:55:32.89 |
-30:45:19.5 |
HIP 103297 |
8.49 |
| 2026-04-15 12:00 |
20:56:24.85 |
-30:40:38.7 |
HIP 103297 |
16.50 |
| 2026-04-16 00:00 |
20:57:16.52 |
-30:35:57.3 |
HIP 103464 |
14.61 |