| Parameter |
Value |
| Designation |
C/2019 G4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-09-16T16:19:43.942080Z |
| Orbit solution date (soln_date, UTC) |
2023-04-24T19:06:38Z |
| Obs used |
7 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-01-04.0000000 |
| e |
1.00013440 |
| q (au) |
5.864733 |
| a (au) |
-43634.843792 |
| i (deg) |
138.390694 |
| Ω (om, deg) |
130.459931 |
| ω (w, deg) |
287.998779 |
| M (ma, deg) |
0.000051 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.578 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.578 |
| n |
6.000 |
| gf |
0.861 |
| gb |
-0.985 |
| k |
1.000 |
| δ90 |
3.282 |
| 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) |
| 2026-09-20 00:00 |
07:06:55.17 |
+47:15:08.4 |
HIP 34366 |
10.52 |
| 2026-09-20 12:00 |
07:06:56.57 |
+47:15:55.7 |
HIP 34366 |
11.12 |
| 2026-09-21 00:00 |
07:06:57.89 |
+47:16:43.2 |
HIP 34366 |
11.75 |
| 2026-09-21 12:00 |
07:06:59.13 |
+47:17:30.8 |
HIP 34366 |
12.41 |
| 2026-09-22 00:00 |
07:07:00.31 |
+47:18:18.7 |
HIP 34366 |
13.10 |
| 2026-09-22 12:00 |
07:07:01.40 |
+47:19:06.8 |
HIP 34366 |
13.81 |
| 2026-09-23 00:00 |
07:07:02.43 |
+47:19:55.1 |
HIP 34366 |
14.54 |
| 2026-09-23 12:00 |
07:07:03.37 |
+47:20:43.5 |
HIP 34366 |
15.28 |
| 2026-09-24 00:00 |
07:07:04.24 |
+47:21:32.2 |
HIP 34366 |
16.04 |
| 2026-09-24 12:00 |
07:07:05.04 |
+47:22:21.1 |
HIP 34366 |
16.81 |
| 2026-09-25 00:00 |
07:07:05.76 |
+47:23:10.2 |
HIP 34366 |
17.59 |
| 2026-09-25 12:00 |
07:07:06.40 |
+47:23:59.4 |
HIP 34366 |
18.38 |
| 2026-09-26 00:00 |
07:07:06.97 |
+47:24:48.9 |
HIP 34366 |
19.18 |
| 2026-09-26 12:00 |
07:07:07.46 |
+47:25:38.5 |
HIP 34366 |
19.99 |
| 2026-09-27 00:00 |
07:07:07.87 |
+47:26:28.3 |
HIP 34366 |
20.80 |
| 2026-09-27 12:00 |
07:07:08.21 |
+47:27:18.3 |
HIP 34375 |
20.67 |
| 2026-09-28 00:00 |
07:07:08.46 |
+47:28:08.5 |
HIP 34375 |
19.85 |
| 2026-09-28 12:00 |
07:07:08.64 |
+47:28:58.9 |
HIP 34375 |
19.02 |
| 2026-09-29 00:00 |
07:07:08.74 |
+47:29:49.4 |
HIP 34375 |
18.20 |
| 2026-09-29 12:00 |
07:07:08.77 |
+47:30:40.1 |
HIP 34375 |
17.38 |
| 2026-09-30 00:00 |
07:07:08.71 |
+47:31:31.0 |
HIP 34375 |
16.57 |
| 2026-09-30 12:00 |
07:07:08.57 |
+47:32:22.1 |
HIP 34375 |
15.76 |
| 2026-10-01 00:00 |
07:07:08.36 |
+47:33:13.3 |
HIP 34375 |
14.95 |
| 2026-10-01 12:00 |
07:07:08.06 |
+47:34:04.7 |
HIP 34375 |
14.15 |
| 2026-10-02 00:00 |
07:07:07.69 |
+47:34:56.2 |
HIP 34375 |
13.37 |
| 2026-10-02 12:00 |
07:07:07.23 |
+47:35:47.9 |
HIP 34375 |
12.59 |
| 2026-10-03 00:00 |
07:07:06.70 |
+47:36:39.8 |
HIP 34375 |
11.83 |
| 2026-10-03 12:00 |
07:07:06.08 |
+47:37:31.8 |
HIP 34375 |
11.09 |
| 2026-10-04 00:00 |
07:07:05.38 |
+47:38:24.0 |
HIP 34375 |
10.37 |
| 2026-10-04 12:00 |
07:07:04.60 |
+47:39:16.3 |
HIP 34375 |
9.69 |
| 2026-10-05 00:00 |
07:07:03.74 |
+47:40:08.8 |
HIP 34375 |
9.05 |
| 2026-10-05 12:00 |
07:07:02.79 |
+47:41:01.4 |
HIP 34375 |
8.46 |
| 2026-10-06 00:00 |
07:07:01.77 |
+47:41:54.1 |
HIP 34375 |
7.93 |
| 2026-10-06 12:00 |
07:07:00.66 |
+47:42:47.0 |
HIP 34375 |
7.48 |
| 2026-10-07 00:00 |
07:06:59.47 |
+47:43:40.0 |
HIP 34375 |
7.14 |
| 2026-10-07 12:00 |
07:06:58.19 |
+47:44:33.2 |
HIP 34375 |
6.90 |
| 2026-10-08 00:00 |
07:06:56.83 |
+47:45:26.5 |
HIP 34375 |
6.79 |
| 2026-10-08 12:00 |
07:06:55.39 |
+47:46:19.9 |
HIP 34375 |
6.82 |
| 2026-10-09 00:00 |
07:06:53.86 |
+47:47:13.4 |
HIP 34375 |
6.98 |
| 2026-10-09 12:00 |
07:06:52.25 |
+47:48:07.0 |
HIP 34375 |
7.28 |
| 2026-10-10 00:00 |
07:06:50.56 |
+47:49:00.8 |
HIP 34375 |
7.69 |
| 2026-10-10 12:00 |
07:06:48.78 |
+47:49:54.7 |
HIP 34375 |
8.21 |
| 2026-10-11 00:00 |
07:06:46.92 |
+47:50:48.6 |
HIP 34375 |
8.80 |