P/2013 W1 (PANSTARRS)
| Parameter |
Value |
| Designation |
P/2013 W1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-08T04:13:11.366400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
105 |
| NEO |
- |
| M1 |
18.800 |
| K1 |
5.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-12-22.0000000 |
| e |
0.59388126 |
| q (au) |
1.415613 |
| a (au) |
3.485712 |
| i (deg) |
4.699497 |
| Ω (om, deg) |
117.856010 |
| ω (w, deg) |
1.327118 |
| M (ma, deg) |
348.463235 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.227 + 3.690\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.227 |
| n |
3.690 |
| gf |
0.800 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:55:13.62 |
-10:05:11.3 |
HIP 113199 |
3.55 |
| 2026-02-03 12:00 |
22:55:44.60 |
-10:02:00.1 |
HIP 113199 |
6.54 |
| 2026-02-04 00:00 |
22:56:15.66 |
-09:58:48.3 |
HIP 113199 |
14.50 |
| 2026-02-04 12:00 |
22:56:46.79 |
-09:55:36.1 |
HIP 113310 |
20.19 |
| 2026-02-05 00:00 |
22:57:18.00 |
-09:52:23.2 |
HIP 113310 |
24.43 |
| 2026-02-05 12:00 |
22:57:49.28 |
-09:49:09.9 |
HIP 113310 |
30.42 |
| 2026-02-06 00:00 |
22:58:20.63 |
-09:45:56.0 |
HIP 113310 |
37.35 |
| 2026-02-06 12:00 |
22:58:52.06 |
-09:42:41.6 |
HIP 113658 |
34.79 |
| 2026-02-07 00:00 |
22:59:23.57 |
-09:39:26.7 |
HIP 113658 |
26.45 |
| 2026-02-07 12:00 |
22:59:55.14 |
-09:36:11.3 |
HIP 113658 |
18.17 |
| 2026-02-08 00:00 |
23:00:26.79 |
-09:32:55.3 |
HIP 113658 |
10.13 |
| 2026-02-08 12:00 |
23:00:58.51 |
-09:29:38.8 |
HIP 113658 |
4.26 |
| 2026-02-09 00:00 |
23:01:30.30 |
-09:26:21.9 |
HIP 113658 |
8.81 |
| 2026-02-09 12:00 |
23:02:02.16 |
-09:23:04.4 |
HIP 113658 |
16.80 |
| 2026-02-10 00:00 |
23:02:34.09 |
-09:19:46.4 |
HIP 113828 |
16.36 |
| 2026-02-10 12:00 |
23:03:06.09 |
-09:16:27.9 |
HIP 113828 |
17.79 |
| 2026-02-11 00:00 |
23:03:38.16 |
-09:13:09.0 |
HIP 113828 |
22.63 |
| 2026-02-11 12:00 |
23:04:10.29 |
-09:09:49.5 |
HIP 113986 |
28.20 |
| 2026-02-12 00:00 |
23:04:42.50 |
-09:06:29.6 |
HIP 113986 |
28.90 |
| 2026-02-12 12:00 |
23:05:14.77 |
-09:03:09.2 |
HIP 114102 |
31.30 |
| 2026-02-13 00:00 |
23:05:47.10 |
-08:59:48.3 |
HIP 114102 |
24.05 |
| 2026-02-13 12:00 |
23:06:19.50 |
-08:56:26.9 |
HIP 114172 |
16.12 |
| 2026-02-14 00:00 |
23:06:51.97 |
-08:53:05.1 |
HIP 114172 |
7.50 |
| 2026-02-14 12:00 |
23:07:24.50 |
-08:49:42.8 |
HIP 114172 |
1.95 |
| 2026-02-15 00:00 |
23:07:57.10 |
-08:46:20.0 |
HIP 114172 |
10.18 |
| 2026-02-15 12:00 |
23:08:29.76 |
-08:42:56.8 |
HIP 114284 |
7.35 |
| 2026-02-16 00:00 |
23:09:02.48 |
-08:39:33.2 |
HIP 114284 |
9.48 |
| 2026-02-16 12:00 |
23:09:35.26 |
-08:36:09.1 |
HIP 114284 |
16.74 |
| 2026-02-17 00:00 |
23:10:08.10 |
-08:32:44.5 |
HIP 114284 |
25.02 |
| 2026-02-17 12:00 |
23:10:41.01 |
-08:29:19.6 |
HIP 114567 |
29.26 |
| 2026-02-18 00:00 |
23:11:13.97 |
-08:25:54.2 |
HIP 114567 |
20.44 |
| 2026-02-18 12:00 |
23:11:47.00 |
-08:22:28.3 |
HIP 114567 |
11.61 |
| 2026-02-19 00:00 |
23:12:20.08 |
-08:19:02.1 |
HIP 114567 |
2.96 |
| 2026-02-19 12:00 |
23:12:53.22 |
-08:15:35.4 |
HIP 114567 |
6.37 |
| 2026-02-20 00:00 |
23:13:26.42 |
-08:12:08.4 |
HIP 114637 |
12.70 |
| 2026-02-20 12:00 |
23:13:59.68 |
-08:08:40.9 |
HIP 114637 |
13.10 |
| 2026-02-21 00:00 |
23:14:32.99 |
-08:05:13.0 |
HIP 114637 |
18.48 |
| 2026-02-21 12:00 |
23:15:06.36 |
-08:01:44.8 |
HIP 114763 |
20.01 |
| 2026-02-22 00:00 |
23:15:39.78 |
-07:58:16.1 |
HIP 114905 |
16.28 |
| 2026-02-22 12:00 |
23:16:13.26 |
-07:54:47.1 |
HIP 114939 |
14.58 |
| 2026-02-23 00:00 |
23:16:46.79 |
-07:51:17.6 |
HIP 114939 |
7.77 |
| 2026-02-23 12:00 |
23:17:20.37 |
-07:47:47.9 |
HIP 114939 |
8.42 |
| 2026-02-24 00:00 |
23:17:54.01 |
-07:44:17.7 |
HIP 115025 |
11.84 |