C/2013 P4 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
09:59:26.66 |
+07:42:41.3 |
HIP 49029 |
23.01 |
| 2026-02-03 12:00 |
09:59:21.07 |
+07:43:09.0 |
HIP 49029 |
23.34 |
| 2026-02-04 00:00 |
09:59:15.47 |
+07:43:36.8 |
HIP 49029 |
23.76 |
| 2026-02-04 12:00 |
09:59:09.86 |
+07:44:04.8 |
HIP 49029 |
24.25 |
| 2026-02-05 00:00 |
09:59:04.23 |
+07:44:33.0 |
HIP 49029 |
24.83 |
| 2026-02-05 12:00 |
09:58:58.59 |
+07:45:01.2 |
HIP 49029 |
25.47 |
| 2026-02-06 00:00 |
09:58:52.94 |
+07:45:29.7 |
HIP 49029 |
26.19 |
| 2026-02-06 12:00 |
09:58:47.27 |
+07:45:58.2 |
HIP 49029 |
26.97 |
| 2026-02-07 00:00 |
09:58:41.60 |
+07:46:26.9 |
HIP 49029 |
27.80 |
| 2026-02-07 12:00 |
09:58:35.91 |
+07:46:55.7 |
HIP 49029 |
28.69 |
| 2026-02-08 00:00 |
09:58:30.21 |
+07:47:24.7 |
HIP 49029 |
29.63 |
| 2026-02-08 12:00 |
09:58:24.50 |
+07:47:53.8 |
HIP 49029 |
30.62 |
| 2026-02-09 00:00 |
09:58:18.78 |
+07:48:23.0 |
HIP 48876 |
30.58 |
| 2026-02-09 12:00 |
09:58:13.05 |
+07:48:52.3 |
HIP 48876 |
30.00 |
| 2026-02-10 00:00 |
09:58:07.32 |
+07:49:21.7 |
HIP 48876 |
29.48 |
| 2026-02-10 12:00 |
09:58:01.57 |
+07:49:51.3 |
HIP 48876 |
29.03 |
| 2026-02-11 00:00 |
09:57:55.82 |
+07:50:20.9 |
HIP 48876 |
28.64 |
| 2026-02-11 12:00 |
09:57:50.07 |
+07:50:50.7 |
HIP 48876 |
28.33 |
| 2026-02-12 00:00 |
09:57:44.30 |
+07:51:20.5 |
HIP 48876 |
28.10 |
| 2026-02-12 12:00 |
09:57:38.54 |
+07:51:50.5 |
HIP 48876 |
27.94 |
| 2026-02-13 00:00 |
09:57:32.77 |
+07:52:20.5 |
HIP 48699 |
26.90 |
| 2026-02-13 12:00 |
09:57:26.99 |
+07:52:50.7 |
HIP 48699 |
25.85 |
| 2026-02-14 00:00 |
09:57:21.21 |
+07:53:20.9 |
HIP 48699 |
24.85 |
| 2026-02-14 12:00 |
09:57:15.43 |
+07:53:51.2 |
HIP 48699 |
23.91 |
| 2026-02-15 00:00 |
09:57:09.65 |
+07:54:21.6 |
HIP 48699 |
23.03 |
| 2026-02-15 12:00 |
09:57:03.86 |
+07:54:52.1 |
HIP 48699 |
22.21 |
| 2026-02-16 00:00 |
09:56:58.08 |
+07:55:22.6 |
HIP 48699 |
21.48 |
| 2026-02-16 12:00 |
09:56:52.30 |
+07:55:53.3 |
HIP 48699 |
20.83 |
| 2026-02-17 00:00 |
09:56:46.51 |
+07:56:24.0 |
HIP 48699 |
20.28 |
| 2026-02-17 12:00 |
09:56:40.73 |
+07:56:54.7 |
HIP 48699 |
19.83 |
| 2026-02-18 00:00 |
09:56:34.95 |
+07:57:25.5 |
HIP 48699 |
19.49 |
| 2026-02-18 12:00 |
09:56:29.17 |
+07:57:56.4 |
HIP 48699 |
19.26 |
| 2026-02-19 00:00 |
09:56:23.40 |
+07:58:27.3 |
HIP 48699 |
19.16 |
| 2026-02-19 12:00 |
09:56:17.63 |
+07:58:58.3 |
HIP 48699 |
19.17 |
| 2026-02-20 00:00 |
09:56:11.87 |
+07:59:29.3 |
HIP 48699 |
19.31 |
| 2026-02-20 12:00 |
09:56:06.11 |
+08:00:00.4 |
HIP 48699 |
19.56 |
| 2026-02-21 00:00 |
09:56:00.35 |
+08:00:31.5 |
HIP 48699 |
19.93 |
| 2026-02-21 12:00 |
09:55:54.61 |
+08:01:02.6 |
HIP 48699 |
20.41 |
| 2026-02-22 00:00 |
09:55:48.87 |
+08:01:33.7 |
HIP 48699 |
20.98 |
| 2026-02-22 12:00 |
09:55:43.13 |
+08:02:04.9 |
HIP 48668 |
21.53 |
| 2026-02-23 00:00 |
09:55:37.41 |
+08:02:36.1 |
HIP 48668 |
21.93 |
| 2026-02-23 12:00 |
09:55:31.70 |
+08:03:07.4 |
HIP 48553 |
21.09 |
| 2026-02-24 00:00 |
09:55:25.99 |
+08:03:38.6 |
HIP 48553 |
19.65 |