| 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) |
| 2026-09-20 00:00 |
01:27:53.07 |
+26:37:35.1 |
HIP 6678 |
33.32 |
| 2026-09-20 12:00 |
01:27:26.78 |
+26:36:15.7 |
HIP 6678 |
28.94 |
| 2026-09-21 00:00 |
01:27:00.27 |
+26:34:53.2 |
HIP 6678 |
25.26 |
| 2026-09-21 12:00 |
01:26:33.56 |
+26:33:27.6 |
HIP 6678 |
22.65 |
| 2026-09-22 00:00 |
01:26:06.65 |
+26:31:58.9 |
HIP 6678 |
21.55 |
| 2026-09-22 12:00 |
01:25:39.54 |
+26:30:27.0 |
HIP 6678 |
22.25 |
| 2026-09-23 00:00 |
01:25:12.24 |
+26:28:52.1 |
HIP 6678 |
24.63 |
| 2026-09-23 12:00 |
01:24:44.76 |
+26:27:14.1 |
HIP 6678 |
28.30 |
| 2026-09-24 00:00 |
01:24:17.11 |
+26:25:33.0 |
HIP 6434 |
23.73 |
| 2026-09-24 12:00 |
01:23:49.28 |
+26:23:48.8 |
HIP 6434 |
18.88 |
| 2026-09-25 00:00 |
01:23:21.29 |
+26:22:01.6 |
HIP 6434 |
15.28 |
| 2026-09-25 12:00 |
01:22:53.14 |
+26:20:11.3 |
HIP 6434 |
14.01 |
| 2026-09-26 00:00 |
01:22:24.84 |
+26:18:18.0 |
HIP 6434 |
15.72 |
| 2026-09-26 12:00 |
01:21:56.40 |
+26:16:21.6 |
HIP 6434 |
19.69 |
| 2026-09-27 00:00 |
01:21:27.81 |
+26:14:22.3 |
HIP 6434 |
24.90 |
| 2026-09-27 12:00 |
01:20:59.10 |
+26:12:20.0 |
HIP 6434 |
30.75 |
| 2026-09-28 00:00 |
01:20:30.25 |
+26:10:14.7 |
HIP 6101 |
29.47 |
| 2026-09-28 12:00 |
01:20:01.29 |
+26:08:06.4 |
HIP 6101 |
22.75 |
| 2026-09-29 00:00 |
01:19:32.22 |
+26:05:55.2 |
HIP 6101 |
16.10 |
| 2026-09-29 12:00 |
01:19:03.03 |
+26:03:41.1 |
HIP 6101 |
9.76 |
| 2026-09-30 00:00 |
01:18:33.75 |
+26:01:24.1 |
HIP 6101 |
5.24 |
| 2026-09-30 12:00 |
01:18:04.37 |
+25:59:04.2 |
HIP 6101 |
7.56 |
| 2026-10-01 00:00 |
01:17:34.91 |
+25:56:41.4 |
HIP 6101 |
13.65 |
| 2026-10-01 12:00 |
01:17:05.37 |
+25:54:15.8 |
HIP 5914 |
15.81 |
| 2026-10-02 00:00 |
01:16:35.75 |
+25:51:47.4 |
HIP 5914 |
8.91 |
| 2026-10-02 12:00 |
01:16:06.07 |
+25:49:16.2 |
HIP 5914 |
3.12 |
| 2026-10-03 00:00 |
01:15:36.32 |
+25:46:42.2 |
HIP 5914 |
6.49 |
| 2026-10-03 12:00 |
01:15:06.53 |
+25:44:05.5 |
HIP 5914 |
13.34 |
| 2026-10-04 00:00 |
01:14:36.69 |
+25:41:26.1 |
HIP 5777 |
10.58 |
| 2026-10-04 12:00 |
01:14:06.80 |
+25:38:44.0 |
HIP 5777 |
10.93 |
| 2026-10-05 00:00 |
01:13:36.89 |
+25:35:59.3 |
HIP 5701 |
9.04 |
| 2026-10-05 12:00 |
01:13:06.96 |
+25:33:11.9 |
HIP 5701 |
6.44 |
| 2026-10-06 00:00 |
01:12:37.00 |
+25:30:22.0 |
HIP 5701 |
10.39 |
| 2026-10-06 12:00 |
01:12:07.04 |
+25:27:29.5 |
HIP 5701 |
16.79 |
| 2026-10-07 00:00 |
01:11:37.07 |
+25:24:34.5 |
HIP 5494 |
17.76 |
| 2026-10-07 12:00 |
01:11:07.11 |
+25:21:37.1 |
HIP 5494 |
12.26 |
| 2026-10-08 00:00 |
01:10:37.16 |
+25:18:37.2 |
HIP 5494 |
9.72 |
| 2026-10-08 12:00 |
01:10:07.23 |
+25:15:34.9 |
HIP 5494 |
12.22 |
| 2026-10-09 00:00 |
01:09:37.33 |
+25:12:30.3 |
HIP 5494 |
17.75 |
| 2026-10-09 12:00 |
01:09:07.46 |
+25:09:23.3 |
HIP 5494 |
24.33 |
| 2026-10-10 00:00 |
01:08:37.63 |
+25:06:14.1 |
HIP 5277 |
17.32 |
| 2026-10-10 12:00 |
01:08:07.85 |
+25:03:02.7 |
HIP 5277 |
9.86 |
| 2026-10-11 00:00 |
01:07:38.13 |
+24:59:49.1 |
HIP 5277 |
2.42 |