| 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) |
| 2026-06-01 00:00 |
06:44:54.87 |
+46:11:45.3 |
HIP 32341 |
13.25 |
| 2026-06-01 12:00 |
06:45:01.32 |
+46:11:32.9 |
HIP 32341 |
12.97 |
| 2026-06-02 00:00 |
06:45:07.81 |
+46:11:20.6 |
HIP 32341 |
12.78 |
| 2026-06-02 12:00 |
06:45:14.33 |
+46:11:08.6 |
HIP 32341 |
12.69 |
| 2026-06-03 00:00 |
06:45:20.88 |
+46:10:56.9 |
HIP 32341 |
12.71 |
| 2026-06-03 12:00 |
06:45:27.46 |
+46:10:45.3 |
HIP 32341 |
12.85 |
| 2026-06-04 00:00 |
06:45:34.08 |
+46:10:34.0 |
HIP 32341 |
13.09 |
| 2026-06-04 12:00 |
06:45:40.72 |
+46:10:22.9 |
HIP 32341 |
13.43 |
| 2026-06-05 00:00 |
06:45:47.39 |
+46:10:12.1 |
HIP 32510 |
13.65 |
| 2026-06-05 12:00 |
06:45:54.10 |
+46:10:01.4 |
HIP 32510 |
12.48 |
| 2026-06-06 00:00 |
06:46:00.83 |
+46:09:51.1 |
HIP 32510 |
11.31 |
| 2026-06-06 12:00 |
06:46:07.59 |
+46:09:40.9 |
HIP 32510 |
10.15 |
| 2026-06-07 00:00 |
06:46:14.38 |
+46:09:31.0 |
HIP 32510 |
8.98 |
| 2026-06-07 12:00 |
06:46:21.19 |
+46:09:21.3 |
HIP 32510 |
7.81 |
| 2026-06-08 00:00 |
06:46:28.03 |
+46:09:11.9 |
HIP 32510 |
6.66 |
| 2026-06-08 12:00 |
06:46:34.90 |
+46:09:02.7 |
HIP 32510 |
5.51 |
| 2026-06-09 00:00 |
06:46:41.80 |
+46:08:53.7 |
HIP 32510 |
4.40 |
| 2026-06-09 12:00 |
06:46:48.72 |
+46:08:45.0 |
HIP 32510 |
3.34 |
| 2026-06-10 00:00 |
06:46:55.66 |
+46:08:36.5 |
HIP 32510 |
2.43 |
| 2026-06-10 12:00 |
06:47:02.63 |
+46:08:28.3 |
HIP 32510 |
1.90 |
| 2026-06-11 00:00 |
06:47:09.62 |
+46:08:20.3 |
HIP 32510 |
2.07 |
| 2026-06-11 12:00 |
06:47:16.64 |
+46:08:12.5 |
HIP 32510 |
2.83 |
| 2026-06-12 00:00 |
06:47:23.68 |
+46:08:05.0 |
HIP 32510 |
3.83 |
| 2026-06-12 12:00 |
06:47:30.74 |
+46:07:57.8 |
HIP 32510 |
4.95 |
| 2026-06-13 00:00 |
06:47:37.82 |
+46:07:50.8 |
HIP 32510 |
6.11 |
| 2026-06-13 12:00 |
06:47:44.92 |
+46:07:44.0 |
HIP 32510 |
7.30 |
| 2026-06-14 00:00 |
06:47:52.05 |
+46:07:37.5 |
HIP 32510 |
8.51 |
| 2026-06-14 12:00 |
06:47:59.19 |
+46:07:31.2 |
HIP 32510 |
9.73 |
| 2026-06-15 00:00 |
06:48:06.36 |
+46:07:25.2 |
HIP 32510 |
10.95 |
| 2026-06-15 12:00 |
06:48:13.54 |
+46:07:19.5 |
HIP 32510 |
12.19 |
| 2026-06-16 00:00 |
06:48:20.74 |
+46:07:14.0 |
HIP 32510 |
13.43 |
| 2026-06-16 12:00 |
06:48:27.96 |
+46:07:08.7 |
HIP 32510 |
14.68 |
| 2026-06-17 00:00 |
06:48:35.20 |
+46:07:03.7 |
HIP 32774 |
15.39 |
| 2026-06-17 12:00 |
06:48:42.45 |
+46:06:59.0 |
HIP 32774 |
14.21 |
| 2026-06-18 00:00 |
06:48:49.72 |
+46:06:54.5 |
HIP 32774 |
13.03 |
| 2026-06-18 12:00 |
06:48:57.01 |
+46:06:50.3 |
HIP 32774 |
11.87 |
| 2026-06-19 00:00 |
06:49:04.31 |
+46:06:46.3 |
HIP 32774 |
10.72 |
| 2026-06-19 12:00 |
06:49:11.62 |
+46:06:42.6 |
HIP 32774 |
9.61 |
| 2026-06-20 00:00 |
06:49:18.95 |
+46:06:39.1 |
HIP 32774 |
8.53 |
| 2026-06-20 12:00 |
06:49:26.29 |
+46:06:36.0 |
HIP 32774 |
7.50 |
| 2026-06-21 00:00 |
06:49:33.64 |
+46:06:33.0 |
HIP 32774 |
6.56 |
| 2026-06-21 12:00 |
06:49:41.01 |
+46:06:30.3 |
HIP 32774 |
5.74 |
| 2026-06-22 00:00 |
06:49:48.38 |
+46:06:27.9 |
HIP 32774 |
5.11 |