| Parameter |
Value |
| Designation |
C/2013 G3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-11-15T04:36:22.164480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:32Z |
| Obs used |
902 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
12.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-06-16.0000000 |
| e |
1.00046366 |
| q (au) |
3.852198 |
| a (au) |
-8308.154934 |
| i (deg) |
64.671516 |
| Ω (om, deg) |
208.130504 |
| ω (w, deg) |
76.495501 |
| M (ma, deg) |
-0.000198 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.310 + 4.874\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.310 |
| n |
4.874 |
| gf |
0.999 |
| gb |
-0.824 |
| k |
1.000 |
| 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 |
03:21:49.95 |
-09:59:43.0 |
HIP 15682 |
20.89 |
| 2026-07-29 12:00 |
03:21:51.54 |
-10:00:14.9 |
HIP 15682 |
21.36 |
| 2026-07-30 00:00 |
03:21:53.10 |
-10:00:47.0 |
HIP 15682 |
21.86 |
| 2026-07-30 12:00 |
03:21:54.62 |
-10:01:19.3 |
HIP 15682 |
22.36 |
| 2026-07-31 00:00 |
03:21:56.11 |
-10:01:51.8 |
HIP 15682 |
22.87 |
| 2026-07-31 12:00 |
03:21:57.56 |
-10:02:24.5 |
HIP 15682 |
23.40 |
| 2026-08-01 00:00 |
03:21:58.98 |
-10:02:57.5 |
HIP 15682 |
23.94 |
| 2026-08-01 12:00 |
03:22:00.36 |
-10:03:30.6 |
HIP 15682 |
24.48 |
| 2026-08-02 00:00 |
03:22:01.71 |
-10:04:04.0 |
HIP 15590 |
24.77 |
| 2026-08-02 12:00 |
03:22:03.02 |
-10:04:37.5 |
HIP 15802 |
24.38 |
| 2026-08-03 00:00 |
03:22:04.29 |
-10:05:11.2 |
HIP 15802 |
23.90 |
| 2026-08-03 12:00 |
03:22:05.53 |
-10:05:45.2 |
HIP 15802 |
23.44 |
| 2026-08-04 00:00 |
03:22:06.73 |
-10:06:19.3 |
HIP 15802 |
22.99 |
| 2026-08-04 12:00 |
03:22:07.90 |
-10:06:53.7 |
HIP 15802 |
22.56 |
| 2026-08-05 00:00 |
03:22:09.03 |
-10:07:28.2 |
HIP 15802 |
22.15 |
| 2026-08-05 12:00 |
03:22:10.12 |
-10:08:02.9 |
HIP 15802 |
21.76 |
| 2026-08-06 00:00 |
03:22:11.18 |
-10:08:37.8 |
HIP 15802 |
21.39 |
| 2026-08-06 12:00 |
03:22:12.20 |
-10:09:12.9 |
HIP 15802 |
21.04 |
| 2026-08-07 00:00 |
03:22:13.18 |
-10:09:48.2 |
HIP 15802 |
20.71 |
| 2026-08-07 12:00 |
03:22:14.13 |
-10:10:23.7 |
HIP 15802 |
20.41 |
| 2026-08-08 00:00 |
03:22:15.04 |
-10:10:59.3 |
HIP 15802 |
20.13 |
| 2026-08-08 12:00 |
03:22:15.91 |
-10:11:35.1 |
HIP 15802 |
19.87 |
| 2026-08-09 00:00 |
03:22:16.75 |
-10:12:11.2 |
HIP 15802 |
19.64 |
| 2026-08-09 12:00 |
03:22:17.54 |
-10:12:47.3 |
HIP 15802 |
19.44 |
| 2026-08-10 00:00 |
03:22:18.31 |
-10:13:23.7 |
HIP 15802 |
19.27 |
| 2026-08-10 12:00 |
03:22:19.03 |
-10:14:00.2 |
HIP 15802 |
19.12 |
| 2026-08-11 00:00 |
03:22:19.71 |
-10:14:37.0 |
HIP 15802 |
19.01 |
| 2026-08-11 12:00 |
03:22:20.36 |
-10:15:13.8 |
HIP 15802 |
18.92 |
| 2026-08-12 00:00 |
03:22:20.97 |
-10:15:50.9 |
HIP 15802 |
18.87 |
| 2026-08-12 12:00 |
03:22:21.55 |
-10:16:28.1 |
HIP 15802 |
18.84 |
| 2026-08-13 00:00 |
03:22:22.08 |
-10:17:05.4 |
HIP 15802 |
18.85 |
| 2026-08-13 12:00 |
03:22:22.58 |
-10:17:43.0 |
HIP 15802 |
18.89 |
| 2026-08-14 00:00 |
03:22:23.04 |
-10:18:20.6 |
HIP 15802 |
18.96 |
| 2026-08-14 12:00 |
03:22:23.46 |
-10:18:58.5 |
HIP 15802 |
19.06 |
| 2026-08-15 00:00 |
03:22:23.84 |
-10:19:36.5 |
HIP 15802 |
19.19 |
| 2026-08-15 12:00 |
03:22:24.19 |
-10:20:14.6 |
HIP 15802 |
19.36 |
| 2026-08-16 00:00 |
03:22:24.49 |
-10:20:52.9 |
HIP 15802 |
19.55 |
| 2026-08-16 12:00 |
03:22:24.76 |
-10:21:31.3 |
HIP 15802 |
19.76 |
| 2026-08-17 00:00 |
03:22:24.99 |
-10:22:09.9 |
HIP 15802 |
20.01 |
| 2026-08-17 12:00 |
03:22:25.19 |
-10:22:48.6 |
HIP 15802 |
20.28 |
| 2026-08-18 00:00 |
03:22:25.34 |
-10:23:27.4 |
HIP 15802 |
20.58 |
| 2026-08-18 12:00 |
03:22:25.46 |
-10:24:06.4 |
HIP 15802 |
20.91 |
| 2026-08-19 00:00 |
03:22:25.54 |
-10:24:45.5 |
HIP 15802 |
21.26 |