317P/WISE
| 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
$$
M_a = (20.000 + 3.235\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.235 |
| gf |
0.999 |
| gb |
-0.794 |
| k |
0.923 |
| δ90 |
3.149 |
| 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) |
| 2026-02-03 00:00 |
21:09:37.72 |
-10:59:35.7 |
HIP 104405 |
13.92 |
| 2026-02-03 12:00 |
21:10:57.69 |
-10:51:48.0 |
HIP 104427 |
26.05 |
| 2026-02-04 00:00 |
21:12:17.39 |
-10:43:59.8 |
HIP 104839 |
30.30 |
| 2026-02-04 12:00 |
21:13:36.81 |
-10:36:11.1 |
HIP 104839 |
9.81 |
| 2026-02-05 00:00 |
21:14:55.97 |
-10:28:22.0 |
HIP 104938 |
10.14 |
| 2026-02-05 12:00 |
21:16:14.85 |
-10:20:32.3 |
HIP 104938 |
12.57 |
| 2026-02-06 00:00 |
21:17:33.47 |
-10:12:42.2 |
HIP 105060 |
9.82 |
| 2026-02-06 12:00 |
21:18:51.82 |
-10:04:51.8 |
HIP 105060 |
28.14 |
| 2026-02-07 00:00 |
21:20:09.91 |
-09:57:00.9 |
HIP 105258 |
26.02 |
| 2026-02-07 12:00 |
21:21:27.74 |
-09:49:09.6 |
HIP 105491 |
30.46 |
| 2026-02-08 00:00 |
21:22:45.30 |
-09:41:18.0 |
HIP 105574 |
22.31 |
| 2026-02-08 12:00 |
21:24:02.60 |
-09:33:26.0 |
HIP 105761 |
20.79 |
| 2026-02-09 00:00 |
21:25:19.64 |
-09:25:33.8 |
HIP 105761 |
19.39 |
| 2026-02-09 12:00 |
21:26:36.43 |
-09:17:41.2 |
HIP 105939 |
19.05 |
| 2026-02-10 00:00 |
21:27:52.96 |
-09:09:48.4 |
HIP 105939 |
11.37 |
| 2026-02-10 12:00 |
21:29:09.23 |
-09:01:55.3 |
HIP 106055 |
4.73 |
| 2026-02-11 00:00 |
21:30:25.25 |
-08:54:02.0 |
HIP 106268 |
18.15 |
| 2026-02-11 12:00 |
21:31:41.01 |
-08:46:08.4 |
HIP 106268 |
3.58 |
| 2026-02-12 00:00 |
21:32:56.53 |
-08:38:14.7 |
HIP 106268 |
22.79 |
| 2026-02-12 12:00 |
21:34:11.80 |
-08:30:20.8 |
HIP 106545 |
35.73 |
| 2026-02-13 00:00 |
21:35:26.81 |
-08:22:26.7 |
HIP 106510 |
41.03 |
| 2026-02-13 12:00 |
21:36:41.58 |
-08:14:32.5 |
HIP 106727 |
26.34 |
| 2026-02-14 00:00 |
21:37:56.10 |
-08:06:38.1 |
HIP 106786 |
15.63 |
| 2026-02-14 12:00 |
21:39:10.38 |
-07:58:43.7 |
HIP 106945 |
15.08 |
| 2026-02-15 00:00 |
21:40:24.41 |
-07:50:49.2 |
HIP 106967 |
24.01 |
| 2026-02-15 12:00 |
21:41:38.20 |
-07:42:54.5 |
HIP 107251 |
32.22 |
| 2026-02-16 00:00 |
21:42:51.75 |
-07:34:59.9 |
HIP 107251 |
13.33 |
| 2026-02-16 12:00 |
21:44:05.06 |
-07:27:05.2 |
HIP 107251 |
10.29 |
| 2026-02-17 00:00 |
21:45:18.12 |
-07:19:10.5 |
HIP 107319 |
18.58 |
| 2026-02-17 12:00 |
21:46:30.95 |
-07:11:15.8 |
HIP 107595 |
33.07 |
| 2026-02-18 00:00 |
21:47:43.55 |
-07:03:21.1 |
HIP 107672 |
23.52 |
| 2026-02-18 12:00 |
21:48:55.90 |
-06:55:26.4 |
HIP 107672 |
27.06 |
| 2026-02-19 00:00 |
21:50:08.02 |
-06:47:31.8 |
HIP 107871 |
20.03 |
| 2026-02-19 12:00 |
21:51:19.91 |
-06:39:37.3 |
HIP 107871 |
0.52 |
| 2026-02-20 00:00 |
21:52:31.56 |
-06:31:42.8 |
HIP 107871 |
18.97 |
| 2026-02-20 12:00 |
21:53:42.98 |
-06:23:48.5 |
HIP 108089 |
7.95 |
| 2026-02-21 00:00 |
21:54:54.17 |
-06:15:54.3 |
HIP 108089 |
20.59 |
| 2026-02-21 12:00 |
21:56:05.13 |
-06:08:00.2 |
HIP 108272 |
18.25 |
| 2026-02-22 00:00 |
21:57:15.86 |
-06:00:06.3 |
HIP 108272 |
20.35 |
| 2026-02-22 12:00 |
21:58:26.37 |
-05:52:12.5 |
HIP 108544 |
26.91 |
| 2026-02-23 00:00 |
21:59:36.64 |
-05:44:18.9 |
HIP 108544 |
16.40 |
| 2026-02-23 12:00 |
22:00:46.70 |
-05:36:25.5 |
HIP 108544 |
23.40 |
| 2026-02-24 00:00 |
22:01:56.52 |
-05:28:32.3 |
HIP 108895 |
26.66 |