P/2017 P1 (PANSTARRS)
| 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
$$
M_a = (16.307 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.307 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.687 |
| k |
0.800 |
| δ90 |
9.708 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
08:44:25.73 |
+09:13:24.0 |
HIP 42837 |
12.98 |
| 2026-02-03 12:00 |
08:44:15.97 |
+09:14:05.1 |
HIP 42837 |
10.60 |
| 2026-02-04 00:00 |
08:44:06.23 |
+09:14:46.5 |
HIP 42837 |
8.31 |
| 2026-02-04 12:00 |
08:43:56.50 |
+09:15:28.0 |
HIP 42837 |
6.17 |
| 2026-02-05 00:00 |
08:43:46.79 |
+09:16:09.8 |
HIP 42837 |
4.43 |
| 2026-02-05 12:00 |
08:43:37.09 |
+09:16:51.7 |
HIP 42837 |
3.69 |
| 2026-02-06 00:00 |
08:43:27.41 |
+09:17:33.9 |
HIP 42837 |
4.47 |
| 2026-02-06 12:00 |
08:43:17.76 |
+09:18:16.2 |
HIP 42837 |
6.21 |
| 2026-02-07 00:00 |
08:43:08.12 |
+09:18:58.6 |
HIP 42837 |
8.34 |
| 2026-02-07 12:00 |
08:42:58.50 |
+09:19:41.3 |
HIP 42837 |
10.61 |
| 2026-02-08 00:00 |
08:42:48.90 |
+09:20:24.1 |
HIP 42762 |
12.90 |
| 2026-02-08 12:00 |
08:42:39.33 |
+09:21:07.0 |
HIP 42748 |
12.44 |
| 2026-02-09 00:00 |
08:42:29.79 |
+09:21:50.2 |
HIP 42748 |
12.20 |
| 2026-02-09 12:00 |
08:42:20.27 |
+09:22:33.4 |
HIP 42748 |
12.45 |
| 2026-02-10 00:00 |
08:42:10.77 |
+09:23:16.8 |
HIP 42748 |
13.16 |
| 2026-02-10 12:00 |
08:42:01.31 |
+09:24:00.4 |
HIP 42748 |
14.25 |
| 2026-02-11 00:00 |
08:41:51.88 |
+09:24:44.0 |
HIP 42748 |
15.64 |
| 2026-02-11 12:00 |
08:41:42.48 |
+09:25:27.8 |
HIP 42748 |
17.25 |
| 2026-02-12 00:00 |
08:41:33.11 |
+09:26:11.7 |
HIP 42748 |
19.03 |
| 2026-02-12 12:00 |
08:41:23.78 |
+09:26:55.8 |
HIP 42748 |
20.94 |
| 2026-02-13 00:00 |
08:41:14.48 |
+09:27:39.9 |
HIP 42594 |
22.47 |
| 2026-02-13 12:00 |
08:41:05.21 |
+09:28:24.1 |
HIP 42594 |
21.30 |
| 2026-02-14 00:00 |
08:40:55.99 |
+09:29:08.5 |
HIP 42594 |
20.34 |
| 2026-02-14 12:00 |
08:40:46.80 |
+09:29:52.9 |
HIP 42594 |
19.62 |
| 2026-02-15 00:00 |
08:40:37.66 |
+09:30:37.4 |
HIP 42594 |
19.17 |
| 2026-02-15 12:00 |
08:40:28.55 |
+09:31:22.0 |
HIP 42594 |
19.00 |
| 2026-02-16 00:00 |
08:40:19.49 |
+09:32:06.7 |
HIP 42594 |
19.12 |
| 2026-02-16 12:00 |
08:40:10.47 |
+09:32:51.4 |
HIP 42594 |
19.52 |
| 2026-02-17 00:00 |
08:40:01.50 |
+09:33:36.2 |
HIP 42594 |
20.17 |
| 2026-02-17 12:00 |
08:39:52.58 |
+09:34:21.0 |
HIP 42594 |
21.06 |
| 2026-02-18 00:00 |
08:39:43.70 |
+09:35:05.9 |
HIP 42594 |
22.15 |
| 2026-02-18 12:00 |
08:39:34.87 |
+09:35:50.8 |
HIP 42353 |
22.15 |
| 2026-02-19 00:00 |
08:39:26.09 |
+09:36:35.8 |
HIP 42353 |
20.05 |
| 2026-02-19 12:00 |
08:39:17.36 |
+09:37:20.8 |
HIP 42353 |
18.02 |
| 2026-02-20 00:00 |
08:39:08.68 |
+09:38:05.8 |
HIP 42353 |
16.06 |
| 2026-02-20 12:00 |
08:39:00.06 |
+09:38:50.9 |
HIP 42353 |
14.21 |
| 2026-02-21 00:00 |
08:38:51.49 |
+09:39:36.0 |
HIP 42353 |
12.51 |
| 2026-02-21 12:00 |
08:38:42.97 |
+09:40:21.0 |
HIP 42353 |
11.01 |
| 2026-02-22 00:00 |
08:38:34.52 |
+09:41:06.1 |
HIP 42353 |
9.80 |
| 2026-02-22 12:00 |
08:38:26.12 |
+09:41:51.2 |
HIP 42353 |
9.00 |
| 2026-02-23 00:00 |
08:38:17.78 |
+09:42:36.2 |
HIP 42353 |
8.70 |
| 2026-02-23 12:00 |
08:38:09.50 |
+09:43:21.3 |
HIP 42353 |
8.94 |
| 2026-02-24 00:00 |
08:38:01.28 |
+09:44:06.3 |
HIP 42353 |
9.67 |