| Parameter |
Value |
| Designation |
C/2013 G8 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-11-14T23:30:02.741760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:34Z |
| Obs used |
147 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-09-14.0000000 |
| e |
0.99844886 |
| q (au) |
5.141176 |
| a (au) |
3314.451067 |
| i (deg) |
27.615046 |
| Ω (om, deg) |
241.021944 |
| ω (w, deg) |
80.168493 |
| M (ma, deg) |
359.999680 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.524 + 2.882\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.524 |
| n |
2.882 |
| gf |
0.988 |
| gb |
-0.652 |
| 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) |
| 2026-07-29 00:00 |
05:50:02.62 |
+11:15:49.9 |
HIP 27641 |
20.49 |
| 2026-07-29 12:00 |
05:50:06.51 |
+11:15:39.1 |
HIP 27641 |
19.94 |
| 2026-07-30 00:00 |
05:50:10.38 |
+11:15:28.2 |
HIP 27641 |
19.42 |
| 2026-07-30 12:00 |
05:50:14.23 |
+11:15:17.1 |
HIP 27641 |
18.95 |
| 2026-07-31 00:00 |
05:50:18.05 |
+11:15:06.0 |
HIP 27641 |
18.51 |
| 2026-07-31 12:00 |
05:50:21.85 |
+11:14:54.7 |
HIP 27641 |
18.13 |
| 2026-08-01 00:00 |
05:50:25.63 |
+11:14:43.4 |
HIP 27641 |
17.79 |
| 2026-08-01 12:00 |
05:50:29.39 |
+11:14:32.0 |
HIP 27641 |
17.49 |
| 2026-08-02 00:00 |
05:50:33.12 |
+11:14:20.4 |
HIP 27641 |
17.25 |
| 2026-08-02 12:00 |
05:50:36.83 |
+11:14:08.8 |
HIP 27641 |
17.06 |
| 2026-08-03 00:00 |
05:50:40.52 |
+11:13:57.1 |
HIP 27641 |
16.93 |
| 2026-08-03 12:00 |
05:50:44.18 |
+11:13:45.2 |
HIP 27641 |
16.84 |
| 2026-08-04 00:00 |
05:50:47.82 |
+11:13:33.3 |
HIP 27641 |
16.81 |
| 2026-08-04 12:00 |
05:50:51.43 |
+11:13:21.3 |
HIP 27641 |
16.83 |
| 2026-08-05 00:00 |
05:50:55.02 |
+11:13:09.2 |
HIP 27641 |
16.90 |
| 2026-08-05 12:00 |
05:50:58.59 |
+11:12:57.0 |
HIP 27641 |
17.02 |
| 2026-08-06 00:00 |
05:51:02.13 |
+11:12:44.7 |
HIP 27641 |
17.19 |
| 2026-08-06 12:00 |
05:51:05.64 |
+11:12:32.3 |
HIP 27641 |
17.40 |
| 2026-08-07 00:00 |
05:51:09.13 |
+11:12:19.8 |
HIP 27641 |
17.66 |
| 2026-08-07 12:00 |
05:51:12.59 |
+11:12:07.2 |
HIP 27641 |
17.96 |
| 2026-08-08 00:00 |
05:51:16.03 |
+11:11:54.5 |
HIP 27641 |
18.29 |
| 2026-08-08 12:00 |
05:51:19.44 |
+11:11:41.7 |
HIP 27641 |
18.66 |
| 2026-08-09 00:00 |
05:51:22.82 |
+11:11:28.9 |
HIP 27641 |
19.06 |
| 2026-08-09 12:00 |
05:51:26.18 |
+11:11:15.9 |
HIP 27641 |
19.49 |
| 2026-08-10 00:00 |
05:51:29.50 |
+11:11:02.9 |
HIP 27641 |
19.95 |
| 2026-08-10 12:00 |
05:51:32.81 |
+11:10:49.7 |
HIP 27641 |
20.43 |
| 2026-08-11 00:00 |
05:51:36.08 |
+11:10:36.5 |
HIP 27641 |
20.93 |
| 2026-08-11 12:00 |
05:51:39.33 |
+11:10:23.2 |
HIP 27641 |
21.45 |
| 2026-08-12 00:00 |
05:51:42.55 |
+11:10:09.8 |
HIP 27641 |
21.99 |
| 2026-08-12 12:00 |
05:51:45.74 |
+11:09:56.3 |
HIP 27641 |
22.54 |
| 2026-08-13 00:00 |
05:51:48.90 |
+11:09:42.7 |
HIP 27641 |
23.11 |
| 2026-08-13 12:00 |
05:51:52.04 |
+11:09:29.1 |
HIP 27641 |
23.69 |
| 2026-08-14 00:00 |
05:51:55.14 |
+11:09:15.4 |
HIP 27641 |
24.27 |
| 2026-08-14 12:00 |
05:51:58.22 |
+11:09:01.5 |
HIP 27641 |
24.87 |
| 2026-08-15 00:00 |
05:52:01.27 |
+11:08:47.6 |
HIP 27641 |
25.48 |
| 2026-08-15 12:00 |
05:52:04.29 |
+11:08:33.6 |
HIP 27641 |
26.09 |
| 2026-08-16 00:00 |
05:52:07.27 |
+11:08:19.6 |
HIP 27641 |
26.70 |
| 2026-08-16 12:00 |
05:52:10.23 |
+11:08:05.4 |
HIP 27641 |
27.32 |
| 2026-08-17 00:00 |
05:52:13.16 |
+11:07:51.2 |
HIP 27641 |
27.95 |
| 2026-08-17 12:00 |
05:52:16.06 |
+11:07:36.9 |
HIP 27641 |
28.57 |
| 2026-08-18 00:00 |
05:52:18.93 |
+11:07:22.5 |
HIP 27641 |
29.20 |
| 2026-08-18 12:00 |
05:52:21.77 |
+11:07:08.0 |
HIP 27641 |
29.83 |
| 2026-08-19 00:00 |
05:52:24.57 |
+11:06:53.5 |
HIP 27641 |
30.47 |