| Parameter |
Value |
| Designation |
C/2016 P4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-10-15T10:34:01.790400Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:32Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
14.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-09-18.0000000 |
| e |
0.98170392 |
| q (au) |
5.891877 |
| a (au) |
322.029424 |
| i (deg) |
29.927110 |
| Ω (om, deg) |
320.784742 |
| ω (w, deg) |
355.902036 |
| M (ma, deg) |
359.995320 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.699 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.699 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.617 |
| 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) |
| 2026-09-20 00:00 |
05:06:06.62 |
+50:22:50.0 |
HIP 23828 |
12.88 |
| 2026-09-20 12:00 |
05:06:06.36 |
+50:23:24.5 |
HIP 23828 |
13.13 |
| 2026-09-21 00:00 |
05:06:06.02 |
+50:23:58.9 |
HIP 23828 |
13.41 |
| 2026-09-21 12:00 |
05:06:05.61 |
+50:24:33.2 |
HIP 23828 |
13.72 |
| 2026-09-22 00:00 |
05:06:05.13 |
+50:25:07.4 |
HIP 23828 |
14.05 |
| 2026-09-22 12:00 |
05:06:04.58 |
+50:25:41.5 |
HIP 23828 |
14.41 |
| 2026-09-23 00:00 |
05:06:03.95 |
+50:26:15.5 |
HIP 23828 |
14.79 |
| 2026-09-23 12:00 |
05:06:03.25 |
+50:26:49.3 |
HIP 23828 |
15.19 |
| 2026-09-24 00:00 |
05:06:02.47 |
+50:27:23.1 |
HIP 23828 |
15.61 |
| 2026-09-24 12:00 |
05:06:01.62 |
+50:27:56.7 |
HIP 23828 |
16.05 |
| 2026-09-25 00:00 |
05:06:00.70 |
+50:28:30.3 |
HIP 23828 |
16.50 |
| 2026-09-25 12:00 |
05:05:59.71 |
+50:29:03.7 |
HIP 23828 |
16.97 |
| 2026-09-26 00:00 |
05:05:58.65 |
+50:29:36.9 |
HIP 23828 |
17.46 |
| 2026-09-26 12:00 |
05:05:57.51 |
+50:30:10.1 |
HIP 23828 |
17.95 |
| 2026-09-27 00:00 |
05:05:56.30 |
+50:30:43.1 |
HIP 23828 |
18.46 |
| 2026-09-27 12:00 |
05:05:55.01 |
+50:31:16.0 |
HIP 23828 |
18.98 |
| 2026-09-28 00:00 |
05:05:53.66 |
+50:31:48.8 |
HIP 23828 |
19.51 |
| 2026-09-28 12:00 |
05:05:52.23 |
+50:32:21.4 |
HIP 23828 |
20.06 |
| 2026-09-29 00:00 |
05:05:50.73 |
+50:32:53.8 |
HIP 23828 |
20.60 |
| 2026-09-29 12:00 |
05:05:49.15 |
+50:33:26.2 |
HIP 23828 |
21.16 |
| 2026-09-30 00:00 |
05:05:47.51 |
+50:33:58.4 |
HIP 23828 |
21.73 |
| 2026-09-30 12:00 |
05:05:45.79 |
+50:34:30.4 |
HIP 23828 |
22.30 |
| 2026-10-01 00:00 |
05:05:44.00 |
+50:35:02.3 |
HIP 23520 |
22.55 |
| 2026-10-01 12:00 |
05:05:42.14 |
+50:35:34.0 |
HIP 23520 |
22.20 |
| 2026-10-02 00:00 |
05:05:40.20 |
+50:36:05.6 |
HIP 23520 |
21.84 |
| 2026-10-02 12:00 |
05:05:38.20 |
+50:36:37.0 |
HIP 23520 |
21.48 |
| 2026-10-03 00:00 |
05:05:36.12 |
+50:37:08.2 |
HIP 23520 |
21.12 |
| 2026-10-03 12:00 |
05:05:33.97 |
+50:37:39.3 |
HIP 23520 |
20.76 |
| 2026-10-04 00:00 |
05:05:31.75 |
+50:38:10.2 |
HIP 23520 |
20.41 |
| 2026-10-04 12:00 |
05:05:29.46 |
+50:38:40.9 |
HIP 23520 |
20.06 |
| 2026-10-05 00:00 |
05:05:27.09 |
+50:39:11.5 |
HIP 23520 |
19.70 |
| 2026-10-05 12:00 |
05:05:24.65 |
+50:39:41.9 |
HIP 23520 |
19.36 |
| 2026-10-06 00:00 |
05:05:22.15 |
+50:40:12.1 |
HIP 23520 |
19.01 |
| 2026-10-06 12:00 |
05:05:19.57 |
+50:40:42.1 |
HIP 23520 |
18.67 |
| 2026-10-07 00:00 |
05:05:16.92 |
+50:41:11.9 |
HIP 23520 |
18.33 |
| 2026-10-07 12:00 |
05:05:14.20 |
+50:41:41.5 |
HIP 23520 |
18.00 |
| 2026-10-08 00:00 |
05:05:11.41 |
+50:42:11.0 |
HIP 23520 |
17.68 |
| 2026-10-08 12:00 |
05:05:08.55 |
+50:42:40.2 |
HIP 23520 |
17.36 |
| 2026-10-09 00:00 |
05:05:05.62 |
+50:43:09.2 |
HIP 23520 |
17.06 |
| 2026-10-09 12:00 |
05:05:02.62 |
+50:43:38.0 |
HIP 23520 |
16.76 |
| 2026-10-10 00:00 |
05:04:59.55 |
+50:44:06.7 |
HIP 23520 |
16.47 |
| 2026-10-10 12:00 |
05:04:56.41 |
+50:44:35.1 |
HIP 23520 |
16.20 |
| 2026-10-11 00:00 |
05:04:53.20 |
+50:45:03.3 |
HIP 23520 |
15.94 |