| Parameter |
Value |
| Designation |
317P/WISE |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-08-08T11:39:00.054720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:23Z |
| Obs used |
93 |
| NEO |
Yes |
| M1 |
19.500 |
| K1 |
4.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-21.0000000 |
| e |
0.58023673 |
| q (au) |
1.241121 |
| a (au) |
2.956716 |
| i (deg) |
11.962566 |
| Ω (om, deg) |
275.692894 |
| ω (w, deg) |
334.741411 |
| M (ma, deg) |
203.072609 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 3.080\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.080 |
| gf |
0.975 |
| gb |
-0.797 |
| k |
0.937 |
| δ90 |
3.293 |
| 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) |
| 2026-06-01 00:00 |
00:53:19.08 |
+16:27:56.1 |
HIP 4048 |
25.90 |
| 2026-06-01 12:00 |
00:53:57.05 |
+16:33:14.0 |
HIP 4303 |
27.31 |
| 2026-06-02 00:00 |
00:54:34.86 |
+16:38:30.8 |
HIP 4303 |
17.95 |
| 2026-06-02 12:00 |
00:55:12.49 |
+16:43:46.7 |
HIP 4303 |
10.88 |
| 2026-06-03 00:00 |
00:55:49.96 |
+16:49:01.5 |
HIP 4303 |
11.46 |
| 2026-06-03 12:00 |
00:56:27.26 |
+16:54:15.2 |
HIP 4303 |
18.94 |
| 2026-06-04 00:00 |
00:57:04.38 |
+16:59:28.0 |
HIP 4303 |
28.23 |
| 2026-06-04 12:00 |
00:57:41.34 |
+17:04:39.7 |
HIP 4303 |
37.99 |
| 2026-06-05 00:00 |
00:58:18.12 |
+17:09:50.4 |
HIP 4696 |
29.62 |
| 2026-06-05 12:00 |
00:58:54.73 |
+17:15:00.1 |
HIP 4696 |
20.68 |
| 2026-06-06 00:00 |
00:59:31.17 |
+17:20:08.8 |
HIP 4696 |
13.62 |
| 2026-06-06 12:00 |
01:00:07.43 |
+17:25:16.4 |
HIP 4696 |
12.14 |
| 2026-06-07 00:00 |
01:00:43.52 |
+17:30:23.0 |
HIP 4696 |
17.63 |
| 2026-06-07 12:00 |
01:01:19.43 |
+17:35:28.6 |
HIP 4751 |
15.19 |
| 2026-06-08 00:00 |
01:01:55.16 |
+17:40:33.1 |
HIP 4751 |
15.37 |
| 2026-06-08 12:00 |
01:02:30.71 |
+17:45:36.6 |
HIP 4751 |
20.88 |
| 2026-06-09 00:00 |
01:03:06.08 |
+17:50:39.1 |
HIP 4996 |
26.00 |
| 2026-06-09 12:00 |
01:03:41.28 |
+17:55:40.5 |
HIP 4996 |
27.81 |
| 2026-06-10 00:00 |
01:04:16.29 |
+18:00:40.9 |
HIP 4996 |
32.56 |
| 2026-06-10 12:00 |
01:04:51.11 |
+18:05:40.2 |
HIP 4996 |
39.17 |
| 2026-06-11 00:00 |
01:05:25.76 |
+18:10:38.5 |
HIP 5293 |
32.89 |
| 2026-06-11 12:00 |
01:06:00.21 |
+18:15:35.8 |
HIP 5293 |
25.17 |
| 2026-06-12 00:00 |
01:06:34.48 |
+18:20:32.0 |
HIP 5293 |
19.25 |
| 2026-06-12 12:00 |
01:07:08.57 |
+18:25:27.1 |
HIP 5293 |
16.99 |
| 2026-06-13 00:00 |
01:07:42.46 |
+18:30:21.2 |
HIP 5293 |
19.64 |
| 2026-06-13 12:00 |
01:08:16.16 |
+18:35:14.2 |
HIP 5293 |
25.67 |
| 2026-06-14 00:00 |
01:08:49.67 |
+18:40:06.1 |
HIP 5429 |
18.14 |
| 2026-06-14 12:00 |
01:09:22.99 |
+18:44:57.0 |
HIP 5429 |
11.51 |
| 2026-06-15 00:00 |
01:09:56.11 |
+18:49:46.8 |
HIP 5429 |
10.34 |
| 2026-06-15 12:00 |
01:10:29.04 |
+18:54:35.6 |
HIP 5429 |
15.78 |
| 2026-06-16 00:00 |
01:11:01.77 |
+18:59:23.2 |
HIP 5429 |
23.59 |
| 2026-06-16 12:00 |
01:11:34.30 |
+19:04:09.8 |
HIP 5429 |
32.03 |
| 2026-06-17 00:00 |
01:12:06.63 |
+19:08:55.3 |
HIP 5800 |
32.68 |
| 2026-06-17 12:00 |
01:12:38.76 |
+19:13:39.6 |
HIP 5800 |
25.78 |
| 2026-06-18 00:00 |
01:13:10.69 |
+19:18:23.0 |
HIP 5800 |
20.57 |
| 2026-06-18 12:00 |
01:13:42.42 |
+19:23:05.2 |
HIP 5800 |
18.44 |
| 2026-06-19 00:00 |
01:14:13.94 |
+19:27:46.3 |
HIP 5800 |
20.32 |
| 2026-06-19 12:00 |
01:14:45.26 |
+19:32:26.3 |
HIP 5687 |
24.76 |
| 2026-06-20 00:00 |
01:15:16.37 |
+19:37:05.2 |
HIP 5687 |
30.36 |
| 2026-06-20 12:00 |
01:15:47.28 |
+19:41:43.1 |
HIP 5687 |
37.11 |
| 2026-06-21 00:00 |
01:16:17.97 |
+19:46:19.8 |
HIP 5878 |
40.27 |
| 2026-06-21 12:00 |
01:16:48.46 |
+19:50:55.4 |
HIP 5878 |
38.82 |
| 2026-06-22 00:00 |
01:17:18.74 |
+19:55:30.0 |
HIP 5878 |
39.18 |