| Parameter |
Value |
| Designation |
P/2013 G4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-02-09T16:30:18.377280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:32Z |
| Obs used |
41 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-04-25.0000000 |
| e |
0.41041543 |
| q (au) |
2.613194 |
| a (au) |
4.432263 |
| i (deg) |
5.925606 |
| Ω (om, deg) |
339.772839 |
| ω (w, deg) |
214.390935 |
| M (ma, deg) |
7.849220 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.266 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.266 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.647 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
00:30:54.87 |
+05:32:11.3 |
HIP 2369 |
14.42 |
| 2026-06-01 12:00 |
00:31:07.51 |
+05:33:49.6 |
HIP 2369 |
17.81 |
| 2026-06-02 00:00 |
00:31:20.05 |
+05:35:27.3 |
HIP 2369 |
21.23 |
| 2026-06-02 12:00 |
00:31:32.50 |
+05:37:04.5 |
HIP 2477 |
20.27 |
| 2026-06-03 00:00 |
00:31:44.85 |
+05:38:41.1 |
HIP 2477 |
19.13 |
| 2026-06-03 12:00 |
00:31:57.11 |
+05:40:17.1 |
HIP 2477 |
18.57 |
| 2026-06-04 00:00 |
00:32:09.26 |
+05:41:52.6 |
HIP 2477 |
18.63 |
| 2026-06-04 12:00 |
00:32:21.32 |
+05:43:27.4 |
HIP 2477 |
19.30 |
| 2026-06-05 00:00 |
00:32:33.27 |
+05:45:01.8 |
HIP 2477 |
20.50 |
| 2026-06-05 12:00 |
00:32:45.13 |
+05:46:35.5 |
HIP 2477 |
22.13 |
| 2026-06-06 00:00 |
00:32:56.89 |
+05:48:08.6 |
HIP 2688 |
20.06 |
| 2026-06-06 12:00 |
00:33:08.54 |
+05:49:41.1 |
HIP 2688 |
16.77 |
| 2026-06-07 00:00 |
00:33:20.10 |
+05:51:13.1 |
HIP 2688 |
13.52 |
| 2026-06-07 12:00 |
00:33:31.55 |
+05:52:44.4 |
HIP 2688 |
10.29 |
| 2026-06-08 00:00 |
00:33:42.89 |
+05:54:15.1 |
HIP 2688 |
7.09 |
| 2026-06-08 12:00 |
00:33:54.14 |
+05:55:45.2 |
HIP 2688 |
3.92 |
| 2026-06-09 00:00 |
00:34:05.28 |
+05:57:14.7 |
HIP 2688 |
0.78 |
| 2026-06-09 12:00 |
00:34:16.31 |
+05:58:43.6 |
HIP 2688 |
2.36 |
| 2026-06-10 00:00 |
00:34:27.23 |
+06:00:11.9 |
HIP 2688 |
5.44 |
| 2026-06-10 12:00 |
00:34:38.05 |
+06:01:39.5 |
HIP 2688 |
8.50 |
| 2026-06-11 00:00 |
00:34:48.76 |
+06:03:06.5 |
HIP 2688 |
11.53 |
| 2026-06-11 12:00 |
00:34:59.37 |
+06:04:32.8 |
HIP 2688 |
14.54 |
| 2026-06-12 00:00 |
00:35:09.86 |
+06:05:58.5 |
HIP 2688 |
17.51 |
| 2026-06-12 12:00 |
00:35:20.24 |
+06:07:23.6 |
HIP 2831 |
16.68 |
| 2026-06-13 00:00 |
00:35:30.52 |
+06:08:48.0 |
HIP 2831 |
14.24 |
| 2026-06-13 12:00 |
00:35:40.68 |
+06:10:11.7 |
HIP 2831 |
12.05 |
| 2026-06-14 00:00 |
00:35:50.72 |
+06:11:34.8 |
HIP 2831 |
10.22 |
| 2026-06-14 12:00 |
00:36:00.66 |
+06:12:57.2 |
HIP 2831 |
8.94 |
| 2026-06-15 00:00 |
00:36:10.48 |
+06:14:19.0 |
HIP 2831 |
8.46 |
| 2026-06-15 12:00 |
00:36:20.19 |
+06:15:40.0 |
HIP 2831 |
8.86 |
| 2026-06-16 00:00 |
00:36:29.78 |
+06:17:00.4 |
HIP 2831 |
10.01 |
| 2026-06-16 12:00 |
00:36:39.26 |
+06:18:20.1 |
HIP 2831 |
11.68 |
| 2026-06-17 00:00 |
00:36:48.62 |
+06:19:39.1 |
HIP 2831 |
13.66 |
| 2026-06-17 12:00 |
00:36:57.86 |
+06:20:57.5 |
HIP 2831 |
15.81 |
| 2026-06-18 00:00 |
00:37:06.98 |
+06:22:15.1 |
HIP 2831 |
18.06 |
| 2026-06-18 12:00 |
00:37:15.99 |
+06:23:32.0 |
HIP 2831 |
20.37 |
| 2026-06-19 00:00 |
00:37:24.88 |
+06:24:48.2 |
HIP 2831 |
22.71 |
| 2026-06-19 12:00 |
00:37:33.64 |
+06:26:03.8 |
HIP 2831 |
25.05 |
| 2026-06-20 00:00 |
00:37:42.29 |
+06:27:18.6 |
HIP 2831 |
27.39 |
| 2026-06-20 12:00 |
00:37:50.82 |
+06:28:32.7 |
HIP 3033 |
29.30 |
| 2026-06-21 00:00 |
00:37:59.23 |
+06:29:46.1 |
HIP 3033 |
29.76 |
| 2026-06-21 12:00 |
00:38:07.51 |
+06:30:58.7 |
HIP 3033 |
30.40 |
| 2026-06-22 00:00 |
00:38:15.68 |
+06:32:10.7 |
HIP 3033 |
31.21 |