| Parameter |
Value |
| Designation |
P/2017 P1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-06-18T14:00:59.025600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-08-29.0000000 |
| e |
0.30846643 |
| q (au) |
5.438117 |
| a (au) |
7.863851 |
| i (deg) |
7.701554 |
| Ω (om, deg) |
221.393844 |
| ω (w, deg) |
122.270978 |
| M (ma, deg) |
346.878497 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.305 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.305 |
| n |
2.000 |
| gf |
0.977 |
| gb |
-0.687 |
| k |
0.800 |
| δ90 |
9.531 |
| 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 |
08:39:42.91 |
+10:49:05.5 |
HIP 42560 |
13.75 |
| 2026-06-01 12:00 |
08:39:52.03 |
+10:48:48.8 |
HIP 42560 |
11.96 |
| 2026-06-02 00:00 |
08:40:01.21 |
+10:48:31.7 |
HIP 42560 |
10.35 |
| 2026-06-02 12:00 |
08:40:10.46 |
+10:48:14.2 |
HIP 42560 |
9.02 |
| 2026-06-03 00:00 |
08:40:19.78 |
+10:47:56.3 |
HIP 42560 |
8.14 |
| 2026-06-03 12:00 |
08:40:29.16 |
+10:47:38.0 |
HIP 42560 |
7.86 |
| 2026-06-04 00:00 |
08:40:38.60 |
+10:47:19.3 |
HIP 42560 |
8.26 |
| 2026-06-04 12:00 |
08:40:48.10 |
+10:47:00.3 |
HIP 42560 |
9.27 |
| 2026-06-05 00:00 |
08:40:57.67 |
+10:46:40.8 |
HIP 42560 |
10.72 |
| 2026-06-05 12:00 |
08:41:07.30 |
+10:46:20.9 |
HIP 42560 |
12.47 |
| 2026-06-06 00:00 |
08:41:16.99 |
+10:46:00.6 |
HIP 42560 |
14.43 |
| 2026-06-06 12:00 |
08:41:26.74 |
+10:45:40.0 |
HIP 42560 |
16.51 |
| 2026-06-07 00:00 |
08:41:36.56 |
+10:45:18.9 |
HIP 42631 |
18.26 |
| 2026-06-07 12:00 |
08:41:46.43 |
+10:44:57.4 |
HIP 42631 |
19.38 |
| 2026-06-08 00:00 |
08:41:56.36 |
+10:44:35.6 |
HIP 42704 |
18.61 |
| 2026-06-08 12:00 |
08:42:06.35 |
+10:44:13.4 |
HIP 42704 |
17.94 |
| 2026-06-09 00:00 |
08:42:16.40 |
+10:43:50.7 |
HIP 42704 |
17.60 |
| 2026-06-09 12:00 |
08:42:26.51 |
+10:43:27.7 |
HIP 42704 |
17.60 |
| 2026-06-10 00:00 |
08:42:36.68 |
+10:43:04.3 |
HIP 42704 |
17.96 |
| 2026-06-10 12:00 |
08:42:46.90 |
+10:42:40.5 |
HIP 42704 |
18.65 |
| 2026-06-11 00:00 |
08:42:57.19 |
+10:42:16.3 |
HIP 42704 |
19.66 |
| 2026-06-11 12:00 |
08:43:07.52 |
+10:41:51.7 |
HIP 42704 |
20.94 |
| 2026-06-12 00:00 |
08:43:17.92 |
+10:41:26.8 |
HIP 42704 |
22.44 |
| 2026-06-12 12:00 |
08:43:28.37 |
+10:41:01.4 |
HIP 42704 |
24.14 |
| 2026-06-13 00:00 |
08:43:38.87 |
+10:40:35.7 |
HIP 42704 |
26.00 |
| 2026-06-13 12:00 |
08:43:49.43 |
+10:40:09.6 |
HIP 42704 |
27.98 |
| 2026-06-14 00:00 |
08:44:00.04 |
+10:39:43.1 |
HIP 42704 |
30.08 |
| 2026-06-14 12:00 |
08:44:10.70 |
+10:39:16.2 |
HIP 42704 |
32.26 |
| 2026-06-15 00:00 |
08:44:21.42 |
+10:38:48.9 |
HIP 43074 |
30.42 |
| 2026-06-15 12:00 |
08:44:32.19 |
+10:38:21.2 |
HIP 43074 |
27.74 |
| 2026-06-16 00:00 |
08:44:43.01 |
+10:37:53.2 |
HIP 43074 |
25.05 |
| 2026-06-16 12:00 |
08:44:53.88 |
+10:37:24.8 |
HIP 43074 |
22.35 |
| 2026-06-17 00:00 |
08:45:04.81 |
+10:36:56.0 |
HIP 43074 |
19.64 |
| 2026-06-17 12:00 |
08:45:15.78 |
+10:36:26.9 |
HIP 43074 |
16.91 |
| 2026-06-18 00:00 |
08:45:26.80 |
+10:35:57.3 |
HIP 43074 |
14.19 |
| 2026-06-18 12:00 |
08:45:37.87 |
+10:35:27.4 |
HIP 43074 |
11.46 |
| 2026-06-19 00:00 |
08:45:48.99 |
+10:34:57.1 |
HIP 43074 |
8.75 |
| 2026-06-19 12:00 |
08:46:00.15 |
+10:34:26.5 |
HIP 43074 |
6.08 |
| 2026-06-20 00:00 |
08:46:11.36 |
+10:33:55.5 |
HIP 43074 |
3.61 |
| 2026-06-20 12:00 |
08:46:22.62 |
+10:33:24.1 |
HIP 43074 |
2.18 |
| 2026-06-21 00:00 |
08:46:33.92 |
+10:32:52.4 |
HIP 43074 |
3.52 |
| 2026-06-21 12:00 |
08:46:45.27 |
+10:32:20.3 |
HIP 43074 |
6.02 |
| 2026-06-22 00:00 |
08:46:56.66 |
+10:31:47.8 |
HIP 43074 |
8.74 |