C/2016 E1 (PANSTARRS)
| 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
$$
M_a = (0.858 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
0.858 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
04:39:24.69 |
+48:17:18.0 |
HIP 21659 |
17.22 |
| 2026-02-03 12:00 |
04:39:19.04 |
+48:16:18.1 |
HIP 21659 |
18.02 |
| 2026-02-04 00:00 |
04:39:13.47 |
+48:15:18.2 |
HIP 21659 |
18.88 |
| 2026-02-04 12:00 |
04:39:07.99 |
+48:14:18.2 |
HIP 21659 |
19.80 |
| 2026-02-05 00:00 |
04:39:02.59 |
+48:13:18.3 |
HIP 21659 |
20.77 |
| 2026-02-05 12:00 |
04:38:57.27 |
+48:12:18.3 |
HIP 21507 |
21.57 |
| 2026-02-06 00:00 |
04:38:52.04 |
+48:11:18.3 |
HIP 21507 |
21.42 |
| 2026-02-06 12:00 |
04:38:46.90 |
+48:10:18.2 |
HIP 21507 |
21.37 |
| 2026-02-07 00:00 |
04:38:41.83 |
+48:09:18.2 |
HIP 21507 |
21.40 |
| 2026-02-07 12:00 |
04:38:36.86 |
+48:08:18.2 |
HIP 21507 |
21.52 |
| 2026-02-08 00:00 |
04:38:31.96 |
+48:07:18.1 |
HIP 21507 |
21.73 |
| 2026-02-08 12:00 |
04:38:27.16 |
+48:06:18.1 |
HIP 21507 |
22.02 |
| 2026-02-09 00:00 |
04:38:22.44 |
+48:05:18.0 |
HIP 21507 |
22.39 |
| 2026-02-09 12:00 |
04:38:17.80 |
+48:04:18.0 |
HIP 21496 |
22.77 |
| 2026-02-10 00:00 |
04:38:13.25 |
+48:03:18.0 |
HIP 21496 |
21.52 |
| 2026-02-10 12:00 |
04:38:08.78 |
+48:02:18.0 |
HIP 21496 |
20.27 |
| 2026-02-11 00:00 |
04:38:04.40 |
+48:01:18.0 |
HIP 21496 |
19.03 |
| 2026-02-11 12:00 |
04:38:00.10 |
+48:00:18.1 |
HIP 21496 |
17.80 |
| 2026-02-12 00:00 |
04:37:55.89 |
+47:59:18.1 |
HIP 21496 |
16.58 |
| 2026-02-12 12:00 |
04:37:51.77 |
+47:58:18.3 |
HIP 21496 |
15.37 |
| 2026-02-13 00:00 |
04:37:47.73 |
+47:57:18.4 |
HIP 21496 |
14.16 |
| 2026-02-13 12:00 |
04:37:43.78 |
+47:56:18.6 |
HIP 21496 |
12.97 |
| 2026-02-14 00:00 |
04:37:39.91 |
+47:55:18.9 |
HIP 21496 |
11.78 |
| 2026-02-14 12:00 |
04:37:36.13 |
+47:54:19.2 |
HIP 21496 |
10.60 |
| 2026-02-15 00:00 |
04:37:32.44 |
+47:53:19.5 |
HIP 21496 |
9.43 |
| 2026-02-15 12:00 |
04:37:28.83 |
+47:52:20.0 |
HIP 21496 |
8.27 |
| 2026-02-16 00:00 |
04:37:25.31 |
+47:51:20.5 |
HIP 21496 |
7.12 |
| 2026-02-16 12:00 |
04:37:21.87 |
+47:50:21.0 |
HIP 21496 |
5.97 |
| 2026-02-17 00:00 |
04:37:18.52 |
+47:49:21.6 |
HIP 21496 |
4.84 |
| 2026-02-17 12:00 |
04:37:15.25 |
+47:48:22.3 |
HIP 21496 |
3.73 |
| 2026-02-18 00:00 |
04:37:12.07 |
+47:47:23.1 |
HIP 21496 |
2.64 |
| 2026-02-18 12:00 |
04:37:08.98 |
+47:46:24.0 |
HIP 21496 |
1.60 |
| 2026-02-19 00:00 |
04:37:05.97 |
+47:45:25.0 |
HIP 21496 |
0.82 |
| 2026-02-19 12:00 |
04:37:03.05 |
+47:44:26.0 |
HIP 21496 |
1.11 |
| 2026-02-20 00:00 |
04:37:00.21 |
+47:43:27.2 |
HIP 21496 |
2.05 |
| 2026-02-20 12:00 |
04:36:57.46 |
+47:42:28.4 |
HIP 21496 |
3.09 |
| 2026-02-21 00:00 |
04:36:54.79 |
+47:41:29.8 |
HIP 21496 |
4.14 |
| 2026-02-21 12:00 |
04:36:52.21 |
+47:40:31.2 |
HIP 21496 |
5.20 |
| 2026-02-22 00:00 |
04:36:49.72 |
+47:39:32.8 |
HIP 21496 |
6.25 |
| 2026-02-22 12:00 |
04:36:47.30 |
+47:38:34.5 |
HIP 21496 |
7.30 |
| 2026-02-23 00:00 |
04:36:44.98 |
+47:37:36.3 |
HIP 21496 |
8.35 |
| 2026-02-23 12:00 |
04:36:42.73 |
+47:36:38.2 |
HIP 21496 |
9.38 |
| 2026-02-24 00:00 |
04:36:40.58 |
+47:35:40.3 |
HIP 21496 |
10.42 |