| Parameter |
Value |
| Designation |
C/2017 E3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-06-06T23:41:41.795520Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
620 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-03-26.0000000 |
| e |
1.01291206 |
| q (au) |
5.926129 |
| a (au) |
-458.960808 |
| i (deg) |
70.717015 |
| Ω (om, deg) |
220.742632 |
| ω (w, deg) |
334.279194 |
| M (ma, deg) |
0.029271 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.638 + 3.939\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.638 |
| n |
3.939 |
| gf |
0.887 |
| gb |
-0.947 |
| k |
1.000 |
| δ90 |
6.116 |
| 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) |
| 2026-05-12 00:00 |
19:23:13.09 |
+50:50:28.8 |
HIP 95273 |
11.73 |
| 2026-05-12 12:00 |
19:23:09.70 |
+50:51:44.3 |
HIP 95273 |
10.41 |
| 2026-05-13 00:00 |
19:23:06.24 |
+50:52:59.4 |
HIP 95273 |
9.10 |
| 2026-05-13 12:00 |
19:23:02.71 |
+50:54:14.0 |
HIP 95273 |
7.82 |
| 2026-05-14 00:00 |
19:22:59.11 |
+50:55:28.3 |
HIP 95273 |
6.58 |
| 2026-05-14 12:00 |
19:22:55.44 |
+50:56:42.1 |
HIP 95273 |
5.41 |
| 2026-05-15 00:00 |
19:22:51.70 |
+50:57:55.4 |
HIP 95273 |
4.35 |
| 2026-05-15 12:00 |
19:22:47.90 |
+50:59:08.4 |
HIP 95273 |
3.52 |
| 2026-05-16 00:00 |
19:22:44.02 |
+51:00:20.8 |
HIP 95273 |
3.11 |
| 2026-05-16 12:00 |
19:22:40.08 |
+51:01:32.9 |
HIP 95273 |
3.26 |
| 2026-05-17 00:00 |
19:22:36.07 |
+51:02:44.5 |
HIP 95273 |
3.91 |
| 2026-05-17 12:00 |
19:22:32.00 |
+51:03:55.6 |
HIP 95273 |
4.87 |
| 2026-05-18 00:00 |
19:22:27.85 |
+51:05:06.2 |
HIP 95273 |
5.98 |
| 2026-05-18 12:00 |
19:22:23.64 |
+51:06:16.4 |
HIP 95273 |
7.17 |
| 2026-05-19 00:00 |
19:22:19.37 |
+51:07:26.1 |
HIP 95273 |
8.42 |
| 2026-05-19 12:00 |
19:22:15.03 |
+51:08:35.3 |
HIP 95273 |
9.69 |
| 2026-05-20 00:00 |
19:22:10.62 |
+51:09:44.0 |
HIP 95273 |
10.98 |
| 2026-05-20 12:00 |
19:22:06.16 |
+51:10:52.2 |
HIP 95273 |
12.28 |
| 2026-05-21 00:00 |
19:22:01.62 |
+51:12:00.0 |
HIP 95273 |
13.59 |
| 2026-05-21 12:00 |
19:21:57.03 |
+51:13:07.2 |
HIP 95273 |
14.90 |
| 2026-05-22 00:00 |
19:21:52.37 |
+51:14:13.9 |
HIP 95273 |
16.21 |
| 2026-05-22 12:00 |
19:21:47.64 |
+51:15:20.1 |
HIP 95273 |
17.53 |
| 2026-05-23 00:00 |
19:21:42.86 |
+51:16:25.8 |
HIP 95273 |
18.85 |
| 2026-05-23 12:00 |
19:21:38.01 |
+51:17:31.0 |
HIP 95273 |
20.17 |
| 2026-05-24 00:00 |
19:21:33.11 |
+51:18:35.6 |
HIP 95273 |
21.49 |
| 2026-05-24 12:00 |
19:21:28.14 |
+51:19:39.7 |
HIP 95273 |
22.80 |
| 2026-05-25 00:00 |
19:21:23.11 |
+51:20:43.3 |
HIP 95273 |
24.12 |
| 2026-05-25 12:00 |
19:21:18.02 |
+51:21:46.3 |
HIP 95273 |
25.44 |
| 2026-05-26 00:00 |
19:21:12.88 |
+51:22:48.8 |
HIP 95273 |
26.75 |
| 2026-05-26 12:00 |
19:21:07.67 |
+51:23:50.8 |
HIP 95273 |
28.07 |
| 2026-05-27 00:00 |
19:21:02.41 |
+51:24:52.2 |
HIP 95273 |
29.38 |
| 2026-05-27 12:00 |
19:20:57.09 |
+51:25:53.0 |
HIP 95273 |
30.69 |
| 2026-05-28 00:00 |
19:20:51.71 |
+51:26:53.3 |
HIP 94814 |
31.56 |
| 2026-05-28 12:00 |
19:20:46.27 |
+51:27:53.0 |
HIP 94814 |
30.93 |
| 2026-05-29 00:00 |
19:20:40.78 |
+51:28:52.2 |
HIP 94814 |
30.34 |
| 2026-05-29 12:00 |
19:20:35.23 |
+51:29:50.8 |
HIP 94814 |
29.79 |
| 2026-05-30 00:00 |
19:20:29.63 |
+51:30:48.8 |
HIP 94814 |
29.27 |
| 2026-05-30 12:00 |
19:20:23.97 |
+51:31:46.2 |
HIP 94814 |
28.79 |
| 2026-05-31 00:00 |
19:20:18.26 |
+51:32:43.1 |
HIP 94814 |
28.35 |
| 2026-05-31 12:00 |
19:20:12.49 |
+51:33:39.3 |
HIP 94814 |
27.95 |
| 2026-06-01 00:00 |
19:20:06.67 |
+51:34:35.0 |
HIP 94814 |
27.60 |
| 2026-06-01 12:00 |
19:20:00.80 |
+51:35:30.1 |
HIP 94814 |
27.29 |
| 2026-06-02 00:00 |
19:19:54.88 |
+51:36:24.6 |
HIP 94814 |
27.03 |