| 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 |
9.997 |
| 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) |
| 2026-07-29 00:00 |
02:26:55.47 |
+09:22:16.5 |
HIP 11211 |
38.89 |
| 2026-07-29 12:00 |
02:27:28.68 |
+09:24:05.1 |
HIP 11603 |
32.75 |
| 2026-07-30 00:00 |
02:28:01.80 |
+09:25:52.6 |
HIP 11603 |
24.44 |
| 2026-07-30 12:00 |
02:28:34.81 |
+09:27:38.9 |
HIP 11603 |
16.20 |
| 2026-07-31 00:00 |
02:29:07.73 |
+09:29:24.0 |
HIP 11603 |
8.18 |
| 2026-07-31 12:00 |
02:29:40.55 |
+09:31:08.0 |
HIP 11603 |
3.08 |
| 2026-08-01 00:00 |
02:30:13.26 |
+09:32:50.7 |
HIP 11603 |
9.41 |
| 2026-08-01 12:00 |
02:30:45.88 |
+09:34:32.3 |
HIP 11603 |
17.39 |
| 2026-08-02 00:00 |
02:31:18.38 |
+09:36:12.6 |
HIP 11603 |
25.50 |
| 2026-08-02 12:00 |
02:31:50.78 |
+09:37:51.8 |
HIP 11603 |
33.61 |
| 2026-08-03 00:00 |
02:32:23.07 |
+09:39:29.7 |
HIP 11864 |
30.54 |
| 2026-08-03 12:00 |
02:32:55.25 |
+09:41:06.3 |
HIP 11864 |
27.23 |
| 2026-08-04 00:00 |
02:33:27.31 |
+09:42:41.8 |
HIP 11864 |
26.11 |
| 2026-08-04 12:00 |
02:33:59.26 |
+09:44:16.0 |
HIP 11864 |
27.43 |
| 2026-08-05 00:00 |
02:34:31.10 |
+09:45:48.9 |
HIP 12076 |
27.76 |
| 2026-08-05 12:00 |
02:35:02.81 |
+09:47:20.5 |
HIP 12076 |
22.24 |
| 2026-08-06 00:00 |
02:35:34.41 |
+09:48:50.9 |
HIP 12076 |
18.60 |
| 2026-08-06 12:00 |
02:36:05.88 |
+09:50:20.0 |
HIP 12076 |
17.99 |
| 2026-08-07 00:00 |
02:36:37.23 |
+09:51:47.8 |
HIP 12076 |
20.63 |
| 2026-08-07 12:00 |
02:37:08.45 |
+09:53:14.3 |
HIP 12227 |
19.98 |
| 2026-08-08 00:00 |
02:37:39.55 |
+09:54:39.5 |
HIP 12227 |
21.24 |
| 2026-08-08 12:00 |
02:38:10.51 |
+09:56:03.4 |
HIP 12227 |
24.96 |
| 2026-08-09 00:00 |
02:38:41.34 |
+09:57:26.0 |
HIP 12227 |
30.21 |
| 2026-08-09 12:00 |
02:39:12.03 |
+09:58:47.2 |
HIP 12497 |
32.33 |
| 2026-08-10 00:00 |
02:39:42.59 |
+10:00:07.1 |
HIP 12497 |
26.30 |
| 2026-08-10 12:00 |
02:40:13.00 |
+10:01:25.6 |
HIP 12529 |
21.29 |
| 2026-08-11 00:00 |
02:40:43.28 |
+10:02:42.7 |
HIP 12529 |
18.10 |
| 2026-08-11 12:00 |
02:41:13.41 |
+10:03:58.5 |
HIP 12529 |
17.77 |
| 2026-08-12 00:00 |
02:41:43.40 |
+10:05:13.0 |
HIP 12529 |
20.39 |
| 2026-08-12 12:00 |
02:42:13.23 |
+10:06:26.0 |
HIP 12529 |
25.02 |
| 2026-08-13 00:00 |
02:42:42.92 |
+10:07:37.7 |
HIP 12599 |
27.19 |
| 2026-08-13 12:00 |
02:43:12.45 |
+10:08:48.0 |
HIP 12828 |
25.65 |
| 2026-08-14 00:00 |
02:43:41.83 |
+10:09:56.9 |
HIP 12828 |
18.60 |
| 2026-08-14 12:00 |
02:44:11.06 |
+10:11:04.3 |
HIP 12828 |
11.92 |
| 2026-08-15 00:00 |
02:44:40.12 |
+10:12:10.4 |
HIP 12828 |
6.66 |
| 2026-08-15 12:00 |
02:45:09.03 |
+10:13:15.1 |
HIP 12828 |
7.12 |
| 2026-08-16 00:00 |
02:45:37.77 |
+10:14:18.3 |
HIP 12828 |
12.62 |
| 2026-08-16 12:00 |
02:46:06.35 |
+10:15:20.1 |
HIP 12828 |
19.19 |
| 2026-08-17 00:00 |
02:46:34.77 |
+10:16:20.5 |
HIP 13042 |
15.32 |
| 2026-08-17 12:00 |
02:47:03.01 |
+10:17:19.5 |
HIP 13042 |
8.88 |
| 2026-08-18 00:00 |
02:47:31.08 |
+10:18:17.0 |
HIP 13042 |
4.62 |
| 2026-08-18 12:00 |
02:47:58.99 |
+10:19:13.1 |
HIP 13043 |
7.73 |
| 2026-08-19 00:00 |
02:48:26.72 |
+10:20:07.7 |
HIP 13043 |
13.77 |