| 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) |
| 2026-09-20 00:00 |
03:09:57.94 |
+10:22:55.1 |
HIP 14601 |
21.76 |
| 2026-09-20 12:00 |
03:10:08.37 |
+10:22:01.5 |
HIP 14778 |
23.88 |
| 2026-09-21 00:00 |
03:10:18.43 |
+10:21:06.2 |
HIP 14778 |
22.08 |
| 2026-09-21 12:00 |
03:10:28.11 |
+10:20:09.1 |
HIP 14778 |
20.46 |
| 2026-09-22 00:00 |
03:10:37.42 |
+10:19:10.2 |
HIP 14778 |
19.04 |
| 2026-09-22 12:00 |
03:10:46.36 |
+10:18:09.5 |
HIP 14778 |
17.82 |
| 2026-09-23 00:00 |
03:10:54.91 |
+10:17:07.1 |
HIP 14778 |
16.83 |
| 2026-09-23 12:00 |
03:11:03.08 |
+10:16:02.8 |
HIP 14778 |
16.06 |
| 2026-09-24 00:00 |
03:11:10.86 |
+10:14:56.7 |
HIP 14778 |
15.54 |
| 2026-09-24 12:00 |
03:11:18.26 |
+10:13:48.8 |
HIP 14792 |
15.04 |
| 2026-09-25 00:00 |
03:11:25.25 |
+10:12:39.2 |
HIP 14792 |
14.55 |
| 2026-09-25 12:00 |
03:11:31.86 |
+10:11:27.8 |
HIP 14792 |
14.27 |
| 2026-09-26 00:00 |
03:11:38.06 |
+10:10:14.5 |
HIP 14792 |
14.18 |
| 2026-09-26 12:00 |
03:11:43.86 |
+10:08:59.5 |
HIP 14906 |
14.27 |
| 2026-09-27 00:00 |
03:11:49.25 |
+10:07:42.7 |
HIP 14906 |
14.45 |
| 2026-09-27 12:00 |
03:11:54.24 |
+10:06:24.1 |
HIP 14792 |
14.87 |
| 2026-09-28 00:00 |
03:11:58.81 |
+10:05:03.7 |
HIP 14792 |
15.32 |
| 2026-09-28 12:00 |
03:12:02.97 |
+10:03:41.5 |
HIP 14792 |
15.85 |
| 2026-09-29 00:00 |
03:12:06.70 |
+10:02:17.5 |
HIP 14792 |
16.44 |
| 2026-09-29 12:00 |
03:12:10.02 |
+10:00:51.8 |
HIP 14792 |
17.06 |
| 2026-09-30 00:00 |
03:12:12.91 |
+09:59:24.3 |
HIP 14792 |
17.70 |
| 2026-09-30 12:00 |
03:12:15.37 |
+09:57:55.0 |
HIP 14792 |
18.37 |
| 2026-10-01 00:00 |
03:12:17.40 |
+09:56:23.9 |
HIP 14792 |
19.05 |
| 2026-10-01 12:00 |
03:12:18.99 |
+09:54:51.0 |
HIP 14792 |
19.73 |
| 2026-10-02 00:00 |
03:12:20.15 |
+09:53:16.4 |
HIP 14792 |
20.42 |
| 2026-10-02 12:00 |
03:12:20.86 |
+09:51:40.1 |
HIP 14792 |
21.13 |
| 2026-10-03 00:00 |
03:12:21.13 |
+09:50:02.0 |
HIP 14792 |
21.84 |
| 2026-10-03 12:00 |
03:12:20.95 |
+09:48:22.1 |
HIP 14792 |
22.56 |
| 2026-10-04 00:00 |
03:12:20.33 |
+09:46:40.6 |
HIP 14792 |
23.31 |
| 2026-10-04 12:00 |
03:12:19.25 |
+09:44:57.3 |
HIP 14792 |
24.07 |
| 2026-10-05 00:00 |
03:12:17.72 |
+09:43:12.3 |
HIP 14792 |
24.88 |
| 2026-10-05 12:00 |
03:12:15.73 |
+09:41:25.6 |
HIP 14792 |
25.71 |
| 2026-10-06 00:00 |
03:12:13.28 |
+09:39:37.2 |
HIP 14792 |
26.60 |
| 2026-10-06 12:00 |
03:12:10.37 |
+09:37:47.2 |
HIP 14792 |
27.54 |
| 2026-10-07 00:00 |
03:12:07.00 |
+09:35:55.5 |
HIP 14803 |
27.91 |
| 2026-10-07 12:00 |
03:12:03.16 |
+09:34:02.2 |
HIP 14803 |
25.80 |
| 2026-10-08 00:00 |
03:11:58.86 |
+09:32:07.2 |
HIP 14803 |
23.61 |
| 2026-10-08 12:00 |
03:11:54.09 |
+09:30:10.7 |
HIP 14803 |
21.34 |
| 2026-10-09 00:00 |
03:11:48.85 |
+09:28:12.6 |
HIP 14803 |
18.99 |
| 2026-10-09 12:00 |
03:11:43.15 |
+09:26:12.9 |
HIP 14803 |
16.56 |
| 2026-10-10 00:00 |
03:11:36.97 |
+09:24:11.7 |
HIP 14803 |
14.05 |
| 2026-10-10 12:00 |
03:11:30.32 |
+09:22:09.0 |
HIP 14803 |
11.49 |
| 2026-10-11 00:00 |
03:11:23.21 |
+09:20:04.7 |
HIP 14803 |
8.89 |