C/2017 K1 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2017 K1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-03-14T18:30:37.512000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:33Z |
| Obs used |
138 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-05-01.0000000 |
| e |
1.00209402 |
| q (au) |
7.285700 |
| a (au) |
-3479.295246 |
| i (deg) |
154.008296 |
| Ω (om, deg) |
225.641843 |
| ω (w, deg) |
4.202591 |
| M (ma, deg) |
0.000227 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.144 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.144 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.867 |
| 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) |
| 2026-02-03 00:00 |
08:31:41.68 |
+46:11:00.1 |
HIP 41734 |
12.94 |
| 2026-02-03 12:00 |
08:31:29.78 |
+46:11:18.6 |
HIP 41734 |
11.00 |
| 2026-02-04 00:00 |
08:31:17.90 |
+46:11:36.6 |
HIP 41734 |
9.14 |
| 2026-02-04 12:00 |
08:31:06.03 |
+46:11:54.0 |
HIP 41734 |
7.41 |
| 2026-02-05 00:00 |
08:30:54.18 |
+46:12:10.9 |
HIP 41734 |
5.90 |
| 2026-02-05 12:00 |
08:30:42.35 |
+46:12:27.2 |
HIP 41734 |
4.85 |
| 2026-02-06 00:00 |
08:30:30.55 |
+46:12:43.0 |
HIP 41734 |
4.55 |
| 2026-02-06 12:00 |
08:30:18.76 |
+46:12:58.3 |
HIP 41734 |
5.14 |
| 2026-02-07 00:00 |
08:30:07.00 |
+46:13:13.1 |
HIP 41734 |
6.38 |
| 2026-02-07 12:00 |
08:29:55.26 |
+46:13:27.3 |
HIP 41734 |
7.95 |
| 2026-02-08 00:00 |
08:29:43.54 |
+46:13:40.9 |
HIP 41734 |
9.70 |
| 2026-02-08 12:00 |
08:29:31.85 |
+46:13:54.1 |
HIP 41734 |
11.55 |
| 2026-02-09 00:00 |
08:29:20.19 |
+46:14:06.7 |
HIP 41525 |
12.65 |
| 2026-02-09 12:00 |
08:29:08.55 |
+46:14:18.7 |
HIP 41525 |
10.63 |
| 2026-02-10 00:00 |
08:28:56.95 |
+46:14:30.2 |
HIP 41525 |
8.61 |
| 2026-02-10 12:00 |
08:28:45.37 |
+46:14:41.2 |
HIP 41525 |
6.61 |
| 2026-02-11 00:00 |
08:28:33.82 |
+46:14:51.7 |
HIP 41525 |
4.61 |
| 2026-02-11 12:00 |
08:28:22.30 |
+46:15:01.6 |
HIP 41525 |
2.62 |
| 2026-02-12 00:00 |
08:28:10.81 |
+46:15:11.0 |
HIP 41525 |
0.68 |
| 2026-02-12 12:00 |
08:27:59.36 |
+46:15:19.8 |
HIP 41525 |
1.41 |
| 2026-02-13 00:00 |
08:27:47.94 |
+46:15:28.1 |
HIP 41525 |
3.37 |
| 2026-02-13 12:00 |
08:27:36.55 |
+46:15:35.8 |
HIP 41525 |
5.34 |
| 2026-02-14 00:00 |
08:27:25.21 |
+46:15:43.1 |
HIP 41525 |
7.30 |
| 2026-02-14 12:00 |
08:27:13.89 |
+46:15:49.8 |
HIP 41525 |
9.25 |
| 2026-02-15 00:00 |
08:27:02.62 |
+46:15:55.9 |
HIP 41525 |
11.20 |
| 2026-02-15 12:00 |
08:26:51.38 |
+46:16:01.5 |
HIP 41525 |
13.15 |
| 2026-02-16 00:00 |
08:26:40.18 |
+46:16:06.6 |
HIP 41525 |
15.08 |
| 2026-02-16 12:00 |
08:26:29.03 |
+46:16:11.2 |
HIP 41525 |
17.01 |
| 2026-02-17 00:00 |
08:26:17.91 |
+46:16:15.2 |
HIP 41525 |
18.93 |
| 2026-02-17 12:00 |
08:26:06.84 |
+46:16:18.7 |
HIP 41525 |
20.85 |
| 2026-02-18 00:00 |
08:25:55.81 |
+46:16:21.7 |
HIP 41525 |
22.75 |
| 2026-02-18 12:00 |
08:25:44.82 |
+46:16:24.1 |
HIP 41185 |
23.33 |
| 2026-02-19 00:00 |
08:25:33.88 |
+46:16:26.0 |
HIP 41185 |
22.15 |
| 2026-02-19 12:00 |
08:25:22.98 |
+46:16:27.4 |
HIP 41185 |
21.07 |
| 2026-02-20 00:00 |
08:25:12.13 |
+46:16:28.3 |
HIP 41185 |
20.10 |
| 2026-02-20 12:00 |
08:25:01.33 |
+46:16:28.6 |
HIP 41185 |
19.27 |
| 2026-02-21 00:00 |
08:24:50.58 |
+46:16:28.5 |
HIP 41185 |
18.59 |
| 2026-02-21 12:00 |
08:24:39.87 |
+46:16:27.8 |
HIP 41185 |
18.06 |
| 2026-02-22 00:00 |
08:24:29.21 |
+46:16:26.6 |
HIP 41185 |
17.71 |
| 2026-02-22 12:00 |
08:24:18.61 |
+46:16:24.8 |
HIP 41185 |
17.54 |
| 2026-02-23 00:00 |
08:24:08.05 |
+46:16:22.6 |
HIP 41185 |
17.55 |
| 2026-02-23 12:00 |
08:23:57.55 |
+46:16:19.9 |
HIP 41185 |
17.73 |
| 2026-02-24 00:00 |
08:23:47.10 |
+46:16:16.6 |
HIP 41185 |
18.09 |