| Parameter |
Value |
| Designation |
C/2013 P4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-12T09:25:24.268800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:39Z |
| Obs used |
229 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-07-13.0000000 |
| e |
0.59605993 |
| q (au) |
5.967053 |
| a (au) |
14.772125 |
| i (deg) |
4.264367 |
| Ω (om, deg) |
256.614561 |
| ω (w, deg) |
113.559028 |
| M (ma, deg) |
359.472396 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.562 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-0.977 |
| k |
1.000 |
| δ90 |
9.957 |
| 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) |
| 2026-03-26 00:00 |
09:50:22.49 |
+08:33:25.3 |
HIP 48370 |
21.16 |
| 2026-03-26 12:00 |
09:50:18.40 |
+08:33:51.7 |
HIP 48370 |
22.26 |
| 2026-03-27 00:00 |
09:50:14.35 |
+08:34:18.0 |
HIP 48370 |
23.35 |
| 2026-03-27 12:00 |
09:50:10.35 |
+08:34:44.0 |
HIP 48370 |
24.43 |
| 2026-03-28 00:00 |
09:50:06.39 |
+08:35:09.9 |
HIP 48145 |
24.95 |
| 2026-03-28 12:00 |
09:50:02.47 |
+08:35:35.6 |
HIP 48145 |
24.55 |
| 2026-03-29 00:00 |
09:49:58.59 |
+08:36:01.1 |
HIP 48145 |
24.20 |
| 2026-03-29 12:00 |
09:49:54.76 |
+08:36:26.4 |
HIP 48145 |
23.90 |
| 2026-03-30 00:00 |
09:49:50.97 |
+08:36:51.6 |
HIP 48145 |
23.64 |
| 2026-03-30 12:00 |
09:49:47.22 |
+08:37:16.6 |
HIP 48145 |
23.42 |
| 2026-03-31 00:00 |
09:49:43.52 |
+08:37:41.4 |
HIP 48145 |
23.26 |
| 2026-03-31 12:00 |
09:49:39.86 |
+08:38:05.9 |
HIP 48145 |
23.14 |
| 2026-04-01 00:00 |
09:49:36.25 |
+08:38:30.4 |
HIP 48146 |
22.62 |
| 2026-04-01 12:00 |
09:49:32.68 |
+08:38:54.6 |
HIP 48146 |
21.86 |
| 2026-04-02 00:00 |
09:49:29.15 |
+08:39:18.6 |
HIP 48146 |
21.12 |
| 2026-04-02 12:00 |
09:49:25.67 |
+08:39:42.4 |
HIP 48146 |
20.41 |
| 2026-04-03 00:00 |
09:49:22.24 |
+08:40:06.0 |
HIP 48146 |
19.72 |
| 2026-04-03 12:00 |
09:49:18.85 |
+08:40:29.5 |
HIP 48146 |
19.06 |
| 2026-04-04 00:00 |
09:49:15.51 |
+08:40:52.7 |
HIP 48146 |
18.44 |
| 2026-04-04 12:00 |
09:49:12.22 |
+08:41:15.7 |
HIP 48146 |
17.84 |
| 2026-04-05 00:00 |
09:49:08.97 |
+08:41:38.5 |
HIP 48146 |
17.27 |
| 2026-04-05 12:00 |
09:49:05.77 |
+08:42:01.1 |
HIP 48146 |
16.74 |
| 2026-04-06 00:00 |
09:49:02.62 |
+08:42:23.5 |
HIP 48146 |
16.24 |
| 2026-04-06 12:00 |
09:48:59.51 |
+08:42:45.7 |
HIP 48146 |
15.78 |
| 2026-04-07 00:00 |
09:48:56.46 |
+08:43:07.7 |
HIP 48146 |
15.36 |
| 2026-04-07 12:00 |
09:48:53.45 |
+08:43:29.4 |
HIP 48146 |
14.98 |
| 2026-04-08 00:00 |
09:48:50.49 |
+08:43:51.0 |
HIP 48146 |
14.63 |
| 2026-04-08 12:00 |
09:48:47.57 |
+08:44:12.3 |
HIP 48146 |
14.33 |
| 2026-04-09 00:00 |
09:48:44.71 |
+08:44:33.4 |
HIP 48146 |
14.07 |
| 2026-04-09 12:00 |
09:48:41.90 |
+08:44:54.3 |
HIP 48146 |
13.85 |
| 2026-04-10 00:00 |
09:48:39.13 |
+08:45:14.9 |
HIP 48146 |
13.66 |
| 2026-04-10 12:00 |
09:48:36.42 |
+08:45:35.3 |
HIP 48146 |
13.53 |
| 2026-04-11 00:00 |
09:48:33.75 |
+08:45:55.5 |
HIP 48146 |
13.43 |
| 2026-04-11 12:00 |
09:48:31.14 |
+08:46:15.5 |
HIP 48146 |
13.37 |
| 2026-04-12 00:00 |
09:48:28.58 |
+08:46:35.2 |
HIP 48146 |
13.34 |
| 2026-04-12 12:00 |
09:48:26.06 |
+08:46:54.7 |
HIP 48146 |
13.35 |
| 2026-04-13 00:00 |
09:48:23.60 |
+08:47:14.0 |
HIP 48146 |
13.40 |
| 2026-04-13 12:00 |
09:48:21.19 |
+08:47:33.0 |
HIP 48146 |
13.47 |
| 2026-04-14 00:00 |
09:48:18.83 |
+08:47:51.8 |
HIP 48146 |
13.58 |
| 2026-04-14 12:00 |
09:48:16.52 |
+08:48:10.3 |
HIP 48146 |
13.71 |
| 2026-04-15 00:00 |
09:48:14.27 |
+08:48:28.6 |
HIP 48146 |
13.86 |
| 2026-04-15 12:00 |
09:48:12.06 |
+08:48:46.7 |
HIP 48146 |
14.03 |
| 2026-04-16 00:00 |
09:48:09.91 |
+08:49:04.5 |
HIP 48146 |
14.22 |