| Parameter |
Value |
| Designation |
C/2016 S1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-03-16T19:29:49.666560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
127 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
24.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-11-07.0000000 |
| e |
0.70884778 |
| q (au) |
2.411908 |
| a (au) |
8.284009 |
| i (deg) |
94.689671 |
| Ω (om, deg) |
227.538223 |
| ω (w, deg) |
273.611282 |
| M (ma, deg) |
354.633893 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.482 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.482 |
| n |
6.000 |
| gf |
0.943 |
| gb |
-0.859 |
| k |
0.992 |
| δ90 |
9.996 |
| 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 |
16:48:47.77 |
+67:44:43.8 |
HIP 82214 |
8.21 |
| 2026-06-01 12:00 |
16:48:26.82 |
+67:45:08.7 |
HIP 82214 |
6.60 |
| 2026-06-02 00:00 |
16:48:05.86 |
+67:45:32.3 |
HIP 82214 |
5.32 |
| 2026-06-02 12:00 |
16:47:44.88 |
+67:45:54.6 |
HIP 82214 |
4.62 |
| 2026-06-03 00:00 |
16:47:23.89 |
+67:46:15.7 |
HIP 82214 |
4.76 |
| 2026-06-03 12:00 |
16:47:02.90 |
+67:46:35.6 |
HIP 82214 |
5.68 |
| 2026-06-04 00:00 |
16:46:41.89 |
+67:46:54.1 |
HIP 82214 |
7.08 |
| 2026-06-04 12:00 |
16:46:20.88 |
+67:47:11.4 |
HIP 82214 |
8.72 |
| 2026-06-05 00:00 |
16:45:59.87 |
+67:47:27.5 |
HIP 82214 |
10.50 |
| 2026-06-05 12:00 |
16:45:38.86 |
+67:47:42.3 |
HIP 82214 |
12.35 |
| 2026-06-06 00:00 |
16:45:17.85 |
+67:47:55.8 |
HIP 82214 |
14.24 |
| 2026-06-06 12:00 |
16:44:56.85 |
+67:48:08.1 |
HIP 82214 |
16.17 |
| 2026-06-07 00:00 |
16:44:35.85 |
+67:48:19.1 |
HIP 82214 |
18.10 |
| 2026-06-07 12:00 |
16:44:14.87 |
+67:48:28.9 |
HIP 81813 |
19.75 |
| 2026-06-08 00:00 |
16:43:53.89 |
+67:48:37.4 |
HIP 81813 |
18.81 |
| 2026-06-08 12:00 |
16:43:32.94 |
+67:48:44.7 |
HIP 81813 |
18.05 |
| 2026-06-09 00:00 |
16:43:11.99 |
+67:48:50.7 |
HIP 81813 |
17.50 |
| 2026-06-09 12:00 |
16:42:51.07 |
+67:48:55.5 |
HIP 81813 |
17.18 |
| 2026-06-10 00:00 |
16:42:30.17 |
+67:48:59.0 |
HIP 81813 |
17.11 |
| 2026-06-10 12:00 |
16:42:09.30 |
+67:49:01.2 |
HIP 81813 |
17.27 |
| 2026-06-11 00:00 |
16:41:48.45 |
+67:49:02.2 |
HIP 81813 |
17.68 |
| 2026-06-11 12:00 |
16:41:27.64 |
+67:49:02.0 |
HIP 81813 |
18.30 |
| 2026-06-12 00:00 |
16:41:06.85 |
+67:49:00.5 |
HIP 81813 |
19.12 |
| 2026-06-12 12:00 |
16:40:46.10 |
+67:48:57.8 |
HIP 81813 |
20.12 |
| 2026-06-13 00:00 |
16:40:25.39 |
+67:48:53.9 |
HIP 81813 |
21.26 |
| 2026-06-13 12:00 |
16:40:04.72 |
+67:48:48.7 |
HIP 81813 |
22.52 |
| 2026-06-14 00:00 |
16:39:44.09 |
+67:48:42.3 |
HIP 81813 |
23.89 |
| 2026-06-14 12:00 |
16:39:23.51 |
+67:48:34.6 |
HIP 81813 |
25.35 |
| 2026-06-15 00:00 |
16:39:02.97 |
+67:48:25.7 |
HIP 81813 |
26.87 |
| 2026-06-15 12:00 |
16:38:42.49 |
+67:48:15.6 |
HIP 81813 |
28.46 |
| 2026-06-16 00:00 |
16:38:22.05 |
+67:48:04.3 |
HIP 81104 |
28.14 |
| 2026-06-16 12:00 |
16:38:01.68 |
+67:47:51.7 |
HIP 81104 |
26.55 |
| 2026-06-17 00:00 |
16:37:41.36 |
+67:47:38.0 |
HIP 81104 |
25.02 |
| 2026-06-17 12:00 |
16:37:21.10 |
+67:47:23.0 |
HIP 81104 |
23.56 |
| 2026-06-18 00:00 |
16:37:00.90 |
+67:47:06.9 |
HIP 81104 |
22.19 |
| 2026-06-18 12:00 |
16:36:40.77 |
+67:46:49.5 |
HIP 81104 |
20.93 |
| 2026-06-19 00:00 |
16:36:20.70 |
+67:46:30.9 |
HIP 81104 |
19.78 |
| 2026-06-19 12:00 |
16:36:00.71 |
+67:46:11.2 |
HIP 81104 |
18.79 |
| 2026-06-20 00:00 |
16:35:40.78 |
+67:45:50.3 |
HIP 81104 |
17.96 |
| 2026-06-20 12:00 |
16:35:20.93 |
+67:45:28.2 |
HIP 81104 |
17.32 |
| 2026-06-21 00:00 |
16:35:01.16 |
+67:45:04.9 |
HIP 81104 |
16.89 |
| 2026-06-21 12:00 |
16:34:41.47 |
+67:44:40.5 |
HIP 81104 |
16.69 |
| 2026-06-22 00:00 |
16:34:21.85 |
+67:44:14.9 |
HIP 81104 |
16.73 |