| Parameter |
Value |
| Designation |
C/2017 F2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-11-26T04:31:31.609920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:32Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
11.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-09-02.0000000 |
| e |
1.00519546 |
| q (au) |
6.927697 |
| a (au) |
-1333.414094 |
| i (deg) |
42.507666 |
| Ω (om, deg) |
38.668006 |
| ω (w, deg) |
134.901946 |
| M (ma, deg) |
-0.001724 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.109 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.109 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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 |
18:16:18.23 |
-61:09:43.2 |
HIP 89695 |
14.78 |
| 2026-06-01 12:00 |
18:16:08.46 |
-61:10:15.2 |
HIP 89695 |
15.85 |
| 2026-06-02 00:00 |
18:15:58.64 |
-61:10:46.7 |
HIP 89695 |
16.96 |
| 2026-06-02 12:00 |
18:15:48.78 |
-61:11:17.7 |
HIP 89695 |
18.10 |
| 2026-06-03 00:00 |
18:15:38.86 |
-61:11:48.2 |
HIP 89695 |
19.26 |
| 2026-06-03 12:00 |
18:15:28.90 |
-61:12:18.3 |
HIP 89695 |
20.45 |
| 2026-06-04 00:00 |
18:15:18.89 |
-61:12:47.8 |
HIP 89217 |
21.02 |
| 2026-06-04 12:00 |
18:15:08.84 |
-61:13:16.8 |
HIP 89217 |
19.78 |
| 2026-06-05 00:00 |
18:14:58.74 |
-61:13:45.3 |
HIP 89217 |
18.55 |
| 2026-06-05 12:00 |
18:14:48.61 |
-61:14:13.3 |
HIP 89217 |
17.33 |
| 2026-06-06 00:00 |
18:14:38.42 |
-61:14:40.8 |
HIP 89217 |
16.11 |
| 2026-06-06 12:00 |
18:14:28.20 |
-61:15:07.7 |
HIP 89217 |
14.90 |
| 2026-06-07 00:00 |
18:14:17.94 |
-61:15:34.2 |
HIP 89217 |
13.71 |
| 2026-06-07 12:00 |
18:14:07.64 |
-61:16:00.1 |
HIP 89217 |
12.53 |
| 2026-06-08 00:00 |
18:13:57.31 |
-61:16:25.5 |
HIP 89217 |
11.38 |
| 2026-06-08 12:00 |
18:13:46.93 |
-61:16:50.3 |
HIP 89217 |
10.27 |
| 2026-06-09 00:00 |
18:13:36.52 |
-61:17:14.7 |
HIP 89217 |
9.19 |
| 2026-06-09 12:00 |
18:13:26.08 |
-61:17:38.5 |
HIP 89217 |
8.19 |
| 2026-06-10 00:00 |
18:13:15.60 |
-61:18:01.8 |
HIP 89217 |
7.27 |
| 2026-06-10 12:00 |
18:13:05.10 |
-61:18:24.5 |
HIP 89217 |
6.49 |
| 2026-06-11 00:00 |
18:12:54.56 |
-61:18:46.7 |
HIP 89217 |
5.89 |
| 2026-06-11 12:00 |
18:12:43.99 |
-61:19:08.4 |
HIP 89217 |
5.53 |
| 2026-06-12 00:00 |
18:12:33.39 |
-61:19:29.6 |
HIP 89217 |
5.47 |
| 2026-06-12 12:00 |
18:12:22.77 |
-61:19:50.2 |
HIP 89217 |
5.72 |
| 2026-06-13 00:00 |
18:12:12.12 |
-61:20:10.2 |
HIP 89217 |
6.23 |
| 2026-06-13 12:00 |
18:12:01.44 |
-61:20:29.7 |
HIP 89217 |
6.95 |
| 2026-06-14 00:00 |
18:11:50.74 |
-61:20:48.7 |
HIP 89217 |
7.83 |
| 2026-06-14 12:00 |
18:11:40.02 |
-61:21:07.1 |
HIP 89217 |
8.81 |
| 2026-06-15 00:00 |
18:11:29.28 |
-61:21:25.0 |
HIP 89217 |
9.86 |
| 2026-06-15 12:00 |
18:11:18.52 |
-61:21:42.3 |
HIP 89217 |
10.97 |
| 2026-06-16 00:00 |
18:11:07.74 |
-61:21:59.1 |
HIP 89217 |
12.12 |
| 2026-06-16 12:00 |
18:10:56.94 |
-61:22:15.3 |
HIP 89217 |
13.30 |
| 2026-06-17 00:00 |
18:10:46.12 |
-61:22:30.9 |
HIP 89217 |
14.50 |
| 2026-06-17 12:00 |
18:10:35.30 |
-61:22:46.1 |
HIP 89217 |
15.71 |
| 2026-06-18 00:00 |
18:10:24.45 |
-61:23:00.6 |
HIP 89217 |
16.94 |
| 2026-06-18 12:00 |
18:10:13.60 |
-61:23:14.6 |
HIP 89217 |
18.17 |
| 2026-06-19 00:00 |
18:10:02.74 |
-61:23:28.1 |
HIP 89217 |
19.42 |
| 2026-06-19 12:00 |
18:09:51.86 |
-61:23:40.9 |
HIP 89217 |
20.67 |
| 2026-06-20 00:00 |
18:09:40.98 |
-61:23:53.3 |
HIP 89217 |
21.93 |
| 2026-06-20 12:00 |
18:09:30.09 |
-61:24:05.1 |
HIP 89217 |
23.19 |
| 2026-06-21 00:00 |
18:09:19.19 |
-61:24:16.3 |
HIP 89217 |
24.45 |
| 2026-06-21 12:00 |
18:09:08.29 |
-61:24:26.9 |
HIP 89217 |
25.72 |
| 2026-06-22 00:00 |
18:08:57.39 |
-61:24:37.1 |
HIP 89217 |
26.98 |