| Parameter |
Value |
| Designation |
P/2017 G1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-05-02T00:43:36.451200Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T00:43:31Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
6.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-04-10.0000000 |
| e |
0.65703536 |
| q (au) |
2.620459 |
| a (au) |
7.640611 |
| i (deg) |
3.575512 |
| Ω (om, deg) |
258.564840 |
| ω (w, deg) |
217.570539 |
| M (ma, deg) |
16.005444 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.768 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.768 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.557 |
| 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) |
| 2026-09-20 00:00 |
19:31:50.60 |
-17:38:55.6 |
HIP 96023 |
6.18 |
| 2026-09-20 12:00 |
19:31:48.15 |
-17:39:09.6 |
HIP 96023 |
5.56 |
| 2026-09-21 00:00 |
19:31:45.79 |
-17:39:23.3 |
HIP 96023 |
4.96 |
| 2026-09-21 12:00 |
19:31:43.51 |
-17:39:36.9 |
HIP 96023 |
4.38 |
| 2026-09-22 00:00 |
19:31:41.33 |
-17:39:50.3 |
HIP 96023 |
3.83 |
| 2026-09-22 12:00 |
19:31:39.23 |
-17:40:03.6 |
HIP 96023 |
3.31 |
| 2026-09-23 00:00 |
19:31:37.22 |
-17:40:16.6 |
HIP 96023 |
2.81 |
| 2026-09-23 12:00 |
19:31:35.29 |
-17:40:29.5 |
HIP 96023 |
2.35 |
| 2026-09-24 00:00 |
19:31:33.46 |
-17:40:42.2 |
HIP 96023 |
1.94 |
| 2026-09-24 12:00 |
19:31:31.71 |
-17:40:54.8 |
HIP 96023 |
1.58 |
| 2026-09-25 00:00 |
19:31:30.05 |
-17:41:07.1 |
HIP 96023 |
1.32 |
| 2026-09-25 12:00 |
19:31:28.48 |
-17:41:19.3 |
HIP 96023 |
1.18 |
| 2026-09-26 00:00 |
19:31:27.00 |
-17:41:31.3 |
HIP 96023 |
1.18 |
| 2026-09-26 12:00 |
19:31:25.60 |
-17:41:43.2 |
HIP 96023 |
1.32 |
| 2026-09-27 00:00 |
19:31:24.29 |
-17:41:54.8 |
HIP 96023 |
1.54 |
| 2026-09-27 12:00 |
19:31:23.08 |
-17:42:06.3 |
HIP 96023 |
1.79 |
| 2026-09-28 00:00 |
19:31:21.95 |
-17:42:17.5 |
HIP 96023 |
2.06 |
| 2026-09-28 12:00 |
19:31:20.91 |
-17:42:28.7 |
HIP 96023 |
2.34 |
| 2026-09-29 00:00 |
19:31:19.95 |
-17:42:39.6 |
HIP 96023 |
2.61 |
| 2026-09-29 12:00 |
19:31:19.09 |
-17:42:50.3 |
HIP 96023 |
2.87 |
| 2026-09-30 00:00 |
19:31:18.31 |
-17:43:00.9 |
HIP 96023 |
3.11 |
| 2026-09-30 12:00 |
19:31:17.63 |
-17:43:11.2 |
HIP 96023 |
3.35 |
| 2026-10-01 00:00 |
19:31:17.03 |
-17:43:21.4 |
HIP 96023 |
3.57 |
| 2026-10-01 12:00 |
19:31:16.52 |
-17:43:31.4 |
HIP 96023 |
3.77 |
| 2026-10-02 00:00 |
19:31:16.10 |
-17:43:41.2 |
HIP 96023 |
3.96 |
| 2026-10-02 12:00 |
19:31:15.77 |
-17:43:50.8 |
HIP 96023 |
4.14 |
| 2026-10-03 00:00 |
19:31:15.53 |
-17:44:00.2 |
HIP 96023 |
4.30 |
| 2026-10-03 12:00 |
19:31:15.38 |
-17:44:09.5 |
HIP 96023 |
4.45 |
| 2026-10-04 00:00 |
19:31:15.32 |
-17:44:18.5 |
HIP 96023 |
4.59 |
| 2026-10-04 12:00 |
19:31:15.35 |
-17:44:27.3 |
HIP 96023 |
4.71 |
| 2026-10-05 00:00 |
19:31:15.46 |
-17:44:36.0 |
HIP 96023 |
4.82 |
| 2026-10-05 12:00 |
19:31:15.67 |
-17:44:44.5 |
HIP 96023 |
4.92 |
| 2026-10-06 00:00 |
19:31:15.96 |
-17:44:52.7 |
HIP 96023 |
5.01 |
| 2026-10-06 12:00 |
19:31:16.35 |
-17:45:00.8 |
HIP 96023 |
5.09 |
| 2026-10-07 00:00 |
19:31:16.83 |
-17:45:08.6 |
HIP 96023 |
5.17 |
| 2026-10-07 12:00 |
19:31:17.39 |
-17:45:16.3 |
HIP 96023 |
5.23 |
| 2026-10-08 00:00 |
19:31:18.04 |
-17:45:23.8 |
HIP 96023 |
5.30 |
| 2026-10-08 12:00 |
19:31:18.79 |
-17:45:31.0 |
HIP 96023 |
5.36 |
| 2026-10-09 00:00 |
19:31:19.62 |
-17:45:38.1 |
HIP 96023 |
5.41 |
| 2026-10-09 12:00 |
19:31:20.54 |
-17:45:45.0 |
HIP 96023 |
5.47 |
| 2026-10-10 00:00 |
19:31:21.55 |
-17:45:51.6 |
HIP 96023 |
5.54 |
| 2026-10-10 12:00 |
19:31:22.66 |
-17:45:58.1 |
HIP 96023 |
5.61 |
| 2026-10-11 00:00 |
19:31:23.85 |
-17:46:04.3 |
HIP 96023 |
5.68 |