| 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) |
| 2026-06-01 00:00 |
19:58:32.60 |
-16:31:09.3 |
HIP 98150 |
25.62 |
| 2026-06-01 12:00 |
19:58:27.24 |
-16:31:14.8 |
HIP 98150 |
24.35 |
| 2026-06-02 00:00 |
19:58:21.81 |
-16:31:20.5 |
HIP 98150 |
23.06 |
| 2026-06-02 12:00 |
19:58:16.31 |
-16:31:26.5 |
HIP 98150 |
21.76 |
| 2026-06-03 00:00 |
19:58:10.74 |
-16:31:32.7 |
HIP 98150 |
20.44 |
| 2026-06-03 12:00 |
19:58:05.10 |
-16:31:39.1 |
HIP 98150 |
19.11 |
| 2026-06-04 00:00 |
19:57:59.38 |
-16:31:45.8 |
HIP 98150 |
17.76 |
| 2026-06-04 12:00 |
19:57:53.60 |
-16:31:52.8 |
HIP 98150 |
16.41 |
| 2026-06-05 00:00 |
19:57:47.75 |
-16:32:00.0 |
HIP 98150 |
15.04 |
| 2026-06-05 12:00 |
19:57:41.82 |
-16:32:07.5 |
HIP 98150 |
13.66 |
| 2026-06-06 00:00 |
19:57:35.83 |
-16:32:15.2 |
HIP 98150 |
12.28 |
| 2026-06-06 12:00 |
19:57:29.77 |
-16:32:23.1 |
HIP 98150 |
10.89 |
| 2026-06-07 00:00 |
19:57:23.65 |
-16:32:31.3 |
HIP 98150 |
9.51 |
| 2026-06-07 12:00 |
19:57:17.46 |
-16:32:39.7 |
HIP 98150 |
8.15 |
| 2026-06-08 00:00 |
19:57:11.20 |
-16:32:48.4 |
HIP 98150 |
6.83 |
| 2026-06-08 12:00 |
19:57:04.87 |
-16:32:57.3 |
HIP 98150 |
5.59 |
| 2026-06-09 00:00 |
19:56:58.48 |
-16:33:06.4 |
HIP 98150 |
4.51 |
| 2026-06-09 12:00 |
19:56:52.02 |
-16:33:15.8 |
HIP 98150 |
3.75 |
| 2026-06-10 00:00 |
19:56:45.50 |
-16:33:25.4 |
HIP 98150 |
3.56 |
| 2026-06-10 12:00 |
19:56:38.92 |
-16:33:35.3 |
HIP 98150 |
4.04 |
| 2026-06-11 00:00 |
19:56:32.27 |
-16:33:45.4 |
HIP 98150 |
5.00 |
| 2026-06-11 12:00 |
19:56:25.56 |
-16:33:55.7 |
HIP 98150 |
6.24 |
| 2026-06-12 00:00 |
19:56:18.79 |
-16:34:06.3 |
HIP 98150 |
7.64 |
| 2026-06-12 12:00 |
19:56:11.95 |
-16:34:17.0 |
HIP 98150 |
9.13 |
| 2026-06-13 00:00 |
19:56:05.06 |
-16:34:28.1 |
HIP 98150 |
10.68 |
| 2026-06-13 12:00 |
19:55:58.10 |
-16:34:39.3 |
HIP 98150 |
12.27 |
| 2026-06-14 00:00 |
19:55:51.09 |
-16:34:50.8 |
HIP 98150 |
13.89 |
| 2026-06-14 12:00 |
19:55:44.01 |
-16:35:02.5 |
HIP 98150 |
15.55 |
| 2026-06-15 00:00 |
19:55:36.88 |
-16:35:14.4 |
HIP 98113 |
16.94 |
| 2026-06-15 12:00 |
19:55:29.69 |
-16:35:26.5 |
HIP 98113 |
18.24 |
| 2026-06-16 00:00 |
19:55:22.45 |
-16:35:38.9 |
HIP 98113 |
19.63 |
| 2026-06-16 12:00 |
19:55:15.15 |
-16:35:51.5 |
HIP 97909 |
20.92 |
| 2026-06-17 00:00 |
19:55:07.79 |
-16:36:04.2 |
HIP 97909 |
19.15 |
| 2026-06-17 12:00 |
19:55:00.38 |
-16:36:17.2 |
HIP 97909 |
17.36 |
| 2026-06-18 00:00 |
19:54:52.92 |
-16:36:30.5 |
HIP 97909 |
15.56 |
| 2026-06-18 12:00 |
19:54:45.41 |
-16:36:43.9 |
HIP 97909 |
13.75 |
| 2026-06-19 00:00 |
19:54:37.84 |
-16:36:57.5 |
HIP 97909 |
11.92 |
| 2026-06-19 12:00 |
19:54:30.22 |
-16:37:11.4 |
HIP 97909 |
10.08 |
| 2026-06-20 00:00 |
19:54:22.55 |
-16:37:25.4 |
HIP 97909 |
8.23 |
| 2026-06-20 12:00 |
19:54:14.83 |
-16:37:39.6 |
HIP 97909 |
6.36 |
| 2026-06-21 00:00 |
19:54:07.07 |
-16:37:54.1 |
HIP 97909 |
4.49 |
| 2026-06-21 12:00 |
19:53:59.25 |
-16:38:08.7 |
HIP 97909 |
2.61 |
| 2026-06-22 00:00 |
19:53:51.39 |
-16:38:23.6 |
HIP 97909 |
0.73 |