| Parameter |
Value |
| Designation |
C/2016 E1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-06-01T02:58:04.794240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:23Z |
| Obs used |
166 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-04-09.0000000 |
| e |
1.00315620 |
| q (au) |
8.176818 |
| a (au) |
-2590.718500 |
| i (deg) |
131.890641 |
| Ω (om, deg) |
233.034543 |
| ω (w, deg) |
47.290330 |
| M (ma, deg) |
-0.000397 |
Magnitude
Scatter + Global Linear
$$
M_a = (0.872 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.872 |
| n |
6.000 |
| gf |
0.998 |
| 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) |
| 2026-09-20 00:00 |
05:02:20.27 |
+46:36:39.0 |
HIP 23477 |
5.41 |
| 2026-09-20 12:00 |
05:02:17.32 |
+46:36:59.1 |
HIP 23477 |
5.68 |
| 2026-09-21 00:00 |
05:02:14.29 |
+46:37:19.1 |
HIP 23477 |
6.01 |
| 2026-09-21 12:00 |
05:02:11.20 |
+46:37:39.0 |
HIP 23477 |
6.39 |
| 2026-09-22 00:00 |
05:02:08.02 |
+46:37:58.7 |
HIP 23477 |
6.83 |
| 2026-09-22 12:00 |
05:02:04.77 |
+46:38:18.3 |
HIP 23477 |
7.30 |
| 2026-09-23 00:00 |
05:02:01.45 |
+46:38:37.8 |
HIP 23477 |
7.82 |
| 2026-09-23 12:00 |
05:01:58.05 |
+46:38:57.1 |
HIP 23477 |
8.36 |
| 2026-09-24 00:00 |
05:01:54.58 |
+46:39:16.4 |
HIP 23477 |
8.94 |
| 2026-09-24 12:00 |
05:01:51.03 |
+46:39:35.4 |
HIP 23477 |
9.54 |
| 2026-09-25 00:00 |
05:01:47.41 |
+46:39:54.4 |
HIP 23477 |
10.17 |
| 2026-09-25 12:00 |
05:01:43.72 |
+46:40:13.2 |
HIP 23477 |
10.81 |
| 2026-09-26 00:00 |
05:01:39.95 |
+46:40:31.8 |
HIP 23477 |
11.48 |
| 2026-09-26 12:00 |
05:01:36.11 |
+46:40:50.3 |
HIP 23477 |
12.16 |
| 2026-09-27 00:00 |
05:01:32.19 |
+46:41:08.6 |
HIP 23477 |
12.86 |
| 2026-09-27 12:00 |
05:01:28.20 |
+46:41:26.8 |
HIP 23477 |
13.58 |
| 2026-09-28 00:00 |
05:01:24.14 |
+46:41:44.8 |
HIP 23477 |
14.31 |
| 2026-09-28 12:00 |
05:01:20.00 |
+46:42:02.7 |
HIP 23477 |
15.06 |
| 2026-09-29 00:00 |
05:01:15.79 |
+46:42:20.4 |
HIP 23477 |
15.82 |
| 2026-09-29 12:00 |
05:01:11.50 |
+46:42:37.9 |
HIP 23477 |
16.59 |
| 2026-09-30 00:00 |
05:01:07.14 |
+46:42:55.2 |
HIP 23477 |
17.38 |
| 2026-09-30 12:00 |
05:01:02.71 |
+46:43:12.4 |
HIP 23477 |
18.18 |
| 2026-10-01 00:00 |
05:00:58.21 |
+46:43:29.4 |
HIP 23477 |
18.99 |
| 2026-10-01 12:00 |
05:00:53.63 |
+46:43:46.3 |
HIP 23477 |
19.82 |
| 2026-10-02 00:00 |
05:00:48.98 |
+46:44:02.9 |
HIP 23477 |
20.66 |
| 2026-10-02 12:00 |
05:00:44.25 |
+46:44:19.3 |
HIP 23477 |
21.50 |
| 2026-10-03 00:00 |
05:00:39.46 |
+46:44:35.6 |
HIP 23477 |
22.37 |
| 2026-10-03 12:00 |
05:00:34.59 |
+46:44:51.7 |
HIP 23156 |
21.83 |
| 2026-10-04 00:00 |
05:00:29.65 |
+46:45:07.5 |
HIP 23156 |
21.00 |
| 2026-10-04 12:00 |
05:00:24.63 |
+46:45:23.2 |
HIP 23156 |
20.17 |
| 2026-10-05 00:00 |
05:00:19.55 |
+46:45:38.7 |
HIP 23156 |
19.35 |
| 2026-10-05 12:00 |
05:00:14.39 |
+46:45:54.0 |
HIP 23156 |
18.52 |
| 2026-10-06 00:00 |
05:00:09.16 |
+46:46:09.0 |
HIP 23156 |
17.69 |
| 2026-10-06 12:00 |
05:00:03.86 |
+46:46:23.9 |
HIP 23156 |
16.87 |
| 2026-10-07 00:00 |
04:59:58.48 |
+46:46:38.5 |
HIP 23156 |
16.06 |
| 2026-10-07 12:00 |
04:59:53.04 |
+46:46:52.9 |
HIP 23156 |
15.26 |
| 2026-10-08 00:00 |
04:59:47.52 |
+46:47:07.1 |
HIP 23156 |
14.47 |
| 2026-10-08 12:00 |
04:59:41.94 |
+46:47:21.0 |
HIP 23156 |
13.70 |
| 2026-10-09 00:00 |
04:59:36.28 |
+46:47:34.8 |
HIP 23156 |
12.96 |
| 2026-10-09 12:00 |
04:59:30.56 |
+46:47:48.3 |
HIP 23156 |
12.25 |
| 2026-10-10 00:00 |
04:59:24.76 |
+46:48:01.5 |
HIP 23156 |
11.58 |
| 2026-10-10 12:00 |
04:59:18.89 |
+46:48:14.6 |
HIP 23156 |
10.97 |
| 2026-10-11 00:00 |
04:59:12.96 |
+46:48:27.4 |
HIP 23156 |
10.42 |