| 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) |
| 2026-07-29 00:00 |
19:42:58.51 |
-17:03:09.9 |
HIP 97134 |
30.35 |
| 2026-07-29 12:00 |
19:42:49.60 |
-17:03:33.0 |
HIP 97134 |
31.67 |
| 2026-07-30 00:00 |
19:42:40.72 |
-17:03:56.1 |
HIP 97134 |
33.08 |
| 2026-07-30 12:00 |
19:42:31.86 |
-17:04:19.2 |
HIP 96779 |
34.20 |
| 2026-07-31 00:00 |
19:42:23.02 |
-17:04:42.4 |
HIP 96779 |
32.36 |
| 2026-07-31 12:00 |
19:42:14.21 |
-17:05:05.5 |
HIP 96779 |
30.57 |
| 2026-08-01 00:00 |
19:42:05.42 |
-17:05:28.7 |
HIP 96779 |
28.83 |
| 2026-08-01 12:00 |
19:41:56.66 |
-17:05:51.9 |
HIP 96779 |
27.15 |
| 2026-08-02 00:00 |
19:41:47.92 |
-17:06:15.0 |
HIP 96779 |
25.55 |
| 2026-08-02 12:00 |
19:41:39.21 |
-17:06:38.2 |
HIP 96779 |
24.03 |
| 2026-08-03 00:00 |
19:41:30.54 |
-17:07:01.4 |
HIP 96779 |
22.62 |
| 2026-08-03 12:00 |
19:41:21.89 |
-17:07:24.6 |
HIP 96779 |
21.33 |
| 2026-08-04 00:00 |
19:41:13.27 |
-17:07:47.8 |
HIP 96779 |
20.17 |
| 2026-08-04 12:00 |
19:41:04.68 |
-17:08:10.9 |
HIP 96779 |
19.19 |
| 2026-08-05 00:00 |
19:40:56.12 |
-17:08:34.1 |
HIP 96779 |
18.39 |
| 2026-08-05 12:00 |
19:40:47.60 |
-17:08:57.3 |
HIP 96779 |
17.80 |
| 2026-08-06 00:00 |
19:40:39.11 |
-17:09:20.4 |
HIP 96779 |
17.45 |
| 2026-08-06 12:00 |
19:40:30.66 |
-17:09:43.5 |
HIP 96779 |
17.34 |
| 2026-08-07 00:00 |
19:40:22.24 |
-17:10:06.6 |
HIP 96779 |
17.47 |
| 2026-08-07 12:00 |
19:40:13.86 |
-17:10:29.7 |
HIP 96779 |
17.83 |
| 2026-08-08 00:00 |
19:40:05.52 |
-17:10:52.8 |
HIP 96779 |
18.41 |
| 2026-08-08 12:00 |
19:39:57.21 |
-17:11:15.9 |
HIP 96779 |
19.19 |
| 2026-08-09 00:00 |
19:39:48.95 |
-17:11:38.9 |
HIP 96666 |
19.18 |
| 2026-08-09 12:00 |
19:39:40.72 |
-17:12:01.9 |
HIP 96666 |
18.73 |
| 2026-08-10 00:00 |
19:39:32.54 |
-17:12:24.9 |
HIP 96666 |
18.48 |
| 2026-08-10 12:00 |
19:39:24.40 |
-17:12:47.8 |
HIP 96666 |
18.45 |
| 2026-08-11 00:00 |
19:39:16.30 |
-17:13:10.7 |
HIP 96666 |
18.63 |
| 2026-08-11 12:00 |
19:39:08.24 |
-17:13:33.6 |
HIP 96666 |
19.02 |
| 2026-08-12 00:00 |
19:39:00.24 |
-17:13:56.4 |
HIP 96666 |
19.59 |
| 2026-08-12 12:00 |
19:38:52.27 |
-17:14:19.2 |
HIP 96666 |
20.33 |
| 2026-08-13 00:00 |
19:38:44.35 |
-17:14:41.9 |
HIP 96666 |
21.21 |
| 2026-08-13 12:00 |
19:38:36.49 |
-17:15:04.6 |
HIP 96666 |
22.23 |
| 2026-08-14 00:00 |
19:38:28.66 |
-17:15:27.2 |
HIP 96666 |
23.35 |
| 2026-08-14 12:00 |
19:38:20.89 |
-17:15:49.8 |
HIP 96462 |
24.04 |
| 2026-08-15 00:00 |
19:38:13.17 |
-17:16:12.4 |
HIP 96462 |
22.16 |
| 2026-08-15 12:00 |
19:38:05.50 |
-17:16:34.8 |
HIP 96462 |
20.29 |
| 2026-08-16 00:00 |
19:37:57.88 |
-17:16:57.3 |
HIP 96462 |
18.44 |
| 2026-08-16 12:00 |
19:37:50.32 |
-17:17:19.6 |
HIP 96462 |
16.59 |
| 2026-08-17 00:00 |
19:37:42.80 |
-17:17:41.9 |
HIP 96462 |
14.76 |
| 2026-08-17 12:00 |
19:37:35.34 |
-17:18:04.2 |
HIP 96462 |
12.95 |
| 2026-08-18 00:00 |
19:37:27.94 |
-17:18:26.3 |
HIP 96462 |
11.15 |
| 2026-08-18 12:00 |
19:37:20.59 |
-17:18:48.4 |
HIP 96462 |
9.36 |
| 2026-08-19 00:00 |
19:37:13.30 |
-17:19:10.4 |
HIP 96462 |
7.58 |