| Parameter |
Value |
| Designation |
C/2019 G2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-12-10T01:37:22.817280Z |
| Orbit solution date (soln_date, UTC) |
2024-04-15T15:43:27Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
5.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-04-02T10:34:13.152000Z |
| Discovery magnitude (MPC) |
21.30 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-10-14.0000000 |
| e |
0.99672459 |
| q (au) |
2.291345 |
| a (au) |
699.559136 |
| i (deg) |
159.211459 |
| Ω (om, deg) |
208.142727 |
| ω (w, deg) |
82.653435 |
| M (ma, deg) |
359.996960 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.208 + 4.325\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.208 |
| n |
4.325 |
| gf |
1.000 |
| gb |
-0.827 |
| k |
0.995 |
| 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 |
23:55:19.46 |
-14:53:10.4 |
HIP 117949 |
3.60 |
| 2026-06-01 12:00 |
23:55:20.74 |
-14:53:30.3 |
HIP 117949 |
3.63 |
| 2026-06-02 00:00 |
23:55:21.96 |
-14:53:50.6 |
HIP 117949 |
3.73 |
| 2026-06-02 12:00 |
23:55:23.13 |
-14:54:11.3 |
HIP 117949 |
3.89 |
| 2026-06-03 00:00 |
23:55:24.26 |
-14:54:32.3 |
HIP 117949 |
4.10 |
| 2026-06-03 12:00 |
23:55:25.33 |
-14:54:53.8 |
HIP 117949 |
4.36 |
| 2026-06-04 00:00 |
23:55:26.36 |
-14:55:15.6 |
HIP 117949 |
4.65 |
| 2026-06-04 12:00 |
23:55:27.33 |
-14:55:37.8 |
HIP 117949 |
4.97 |
| 2026-06-05 00:00 |
23:55:28.25 |
-14:56:00.4 |
HIP 117949 |
5.32 |
| 2026-06-05 12:00 |
23:55:29.13 |
-14:56:23.3 |
HIP 117949 |
5.69 |
| 2026-06-06 00:00 |
23:55:29.95 |
-14:56:46.7 |
HIP 117949 |
6.07 |
| 2026-06-06 12:00 |
23:55:30.72 |
-14:57:10.4 |
HIP 117949 |
6.46 |
| 2026-06-07 00:00 |
23:55:31.44 |
-14:57:34.5 |
HIP 117949 |
6.87 |
| 2026-06-07 12:00 |
23:55:32.10 |
-14:57:59.0 |
HIP 117949 |
7.29 |
| 2026-06-08 00:00 |
23:55:32.72 |
-14:58:23.8 |
HIP 117949 |
7.71 |
| 2026-06-08 12:00 |
23:55:33.28 |
-14:58:49.1 |
HIP 117949 |
8.14 |
| 2026-06-09 00:00 |
23:55:33.79 |
-14:59:14.7 |
HIP 117949 |
8.58 |
| 2026-06-09 12:00 |
23:55:34.25 |
-14:59:40.7 |
HIP 117949 |
9.02 |
| 2026-06-10 00:00 |
23:55:34.66 |
-15:00:07.0 |
HIP 117949 |
9.47 |
| 2026-06-10 12:00 |
23:55:35.02 |
-15:00:33.8 |
HIP 117949 |
9.92 |
| 2026-06-11 00:00 |
23:55:35.32 |
-15:01:00.9 |
HIP 117949 |
10.38 |
| 2026-06-11 12:00 |
23:55:35.57 |
-15:01:28.4 |
HIP 117949 |
10.84 |
| 2026-06-12 00:00 |
23:55:35.76 |
-15:01:56.2 |
HIP 117949 |
11.30 |
| 2026-06-12 12:00 |
23:55:35.91 |
-15:02:24.5 |
HIP 117949 |
11.78 |
| 2026-06-13 00:00 |
23:55:36.00 |
-15:02:53.1 |
HIP 117949 |
12.25 |
| 2026-06-13 12:00 |
23:55:36.04 |
-15:03:22.1 |
HIP 117949 |
12.73 |
| 2026-06-14 00:00 |
23:55:36.02 |
-15:03:51.4 |
HIP 117949 |
13.22 |
| 2026-06-14 12:00 |
23:55:35.95 |
-15:04:21.1 |
HIP 117949 |
13.71 |
| 2026-06-15 00:00 |
23:55:35.82 |
-15:04:51.2 |
HIP 117949 |
14.21 |
| 2026-06-15 12:00 |
23:55:35.65 |
-15:05:21.7 |
HIP 117949 |
14.71 |
| 2026-06-16 00:00 |
23:55:35.42 |
-15:05:52.5 |
HIP 117949 |
15.22 |
| 2026-06-16 12:00 |
23:55:35.13 |
-15:06:23.7 |
HIP 117949 |
15.73 |
| 2026-06-17 00:00 |
23:55:34.79 |
-15:06:55.2 |
HIP 117949 |
16.25 |
| 2026-06-17 12:00 |
23:55:34.40 |
-15:07:27.1 |
HIP 117949 |
16.77 |
| 2026-06-18 00:00 |
23:55:33.95 |
-15:07:59.4 |
HIP 117949 |
17.30 |
| 2026-06-18 12:00 |
23:55:33.44 |
-15:08:32.0 |
HIP 117949 |
17.84 |
| 2026-06-19 00:00 |
23:55:32.89 |
-15:09:05.0 |
HIP 117949 |
18.38 |
| 2026-06-19 12:00 |
23:55:32.28 |
-15:09:38.3 |
HIP 117949 |
18.94 |
| 2026-06-20 00:00 |
23:55:31.61 |
-15:10:12.0 |
HIP 117949 |
19.49 |
| 2026-06-20 12:00 |
23:55:30.89 |
-15:10:46.0 |
HIP 117949 |
20.06 |
| 2026-06-21 00:00 |
23:55:30.12 |
-15:11:20.4 |
HIP 117949 |
20.63 |
| 2026-06-21 12:00 |
23:55:29.29 |
-15:11:55.1 |
HIP 117949 |
21.21 |
| 2026-06-22 00:00 |
23:55:28.40 |
-15:12:30.2 |
HIP 117949 |
21.80 |