| Parameter |
Value |
| Designation |
C/2015 V4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-08-27T23:52:13.535040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:16Z |
| Obs used |
79 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-03-18.0000000 |
| e |
0.70560176 |
| q (au) |
5.459628 |
| a (au) |
18.545043 |
| i (deg) |
60.751306 |
| Ω (om, deg) |
179.896328 |
| ω (w, deg) |
306.907117 |
| M (ma, deg) |
357.988428 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.197 + 4.797\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.197 |
| n |
4.797 |
| gf |
1.000 |
| 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) |
| 2026-07-29 00:00 |
16:47:45.28 |
+38:25:24.3 |
HIP 81967 |
38.15 |
| 2026-07-29 12:00 |
16:47:41.67 |
+38:24:19.9 |
HIP 81967 |
37.84 |
| 2026-07-30 00:00 |
16:47:38.12 |
+38:23:15.0 |
HIP 81967 |
37.59 |
| 2026-07-30 12:00 |
16:47:34.63 |
+38:22:09.7 |
HIP 81967 |
37.39 |
| 2026-07-31 00:00 |
16:47:31.20 |
+38:21:03.9 |
HIP 81967 |
37.25 |
| 2026-07-31 12:00 |
16:47:27.84 |
+38:19:57.7 |
HIP 81967 |
37.17 |
| 2026-08-01 00:00 |
16:47:24.53 |
+38:18:51.0 |
HIP 81967 |
37.14 |
| 2026-08-01 12:00 |
16:47:21.29 |
+38:17:43.9 |
HIP 81967 |
37.18 |
| 2026-08-02 00:00 |
16:47:18.12 |
+38:16:36.4 |
HIP 81967 |
37.27 |
| 2026-08-02 12:00 |
16:47:15.00 |
+38:15:28.4 |
HIP 81967 |
37.42 |
| 2026-08-03 00:00 |
16:47:11.96 |
+38:14:20.0 |
HIP 81967 |
37.63 |
| 2026-08-03 12:00 |
16:47:08.97 |
+38:13:11.3 |
HIP 81967 |
37.89 |
| 2026-08-04 00:00 |
16:47:06.05 |
+38:12:02.0 |
HIP 81967 |
38.21 |
| 2026-08-04 12:00 |
16:47:03.19 |
+38:10:52.4 |
HIP 82203 |
37.88 |
| 2026-08-05 00:00 |
16:47:00.40 |
+38:09:42.4 |
HIP 82203 |
36.84 |
| 2026-08-05 12:00 |
16:46:57.68 |
+38:08:32.0 |
HIP 82203 |
35.81 |
| 2026-08-06 00:00 |
16:46:55.02 |
+38:07:21.2 |
HIP 82203 |
34.78 |
| 2026-08-06 12:00 |
16:46:52.42 |
+38:06:10.1 |
HIP 82203 |
33.76 |
| 2026-08-07 00:00 |
16:46:49.89 |
+38:04:58.5 |
HIP 82203 |
32.76 |
| 2026-08-07 12:00 |
16:46:47.43 |
+38:03:46.6 |
HIP 82203 |
31.76 |
| 2026-08-08 00:00 |
16:46:45.03 |
+38:02:34.3 |
HIP 82203 |
30.77 |
| 2026-08-08 12:00 |
16:46:42.70 |
+38:01:21.7 |
HIP 82203 |
29.80 |
| 2026-08-09 00:00 |
16:46:40.44 |
+38:00:08.7 |
HIP 82203 |
28.85 |
| 2026-08-09 12:00 |
16:46:38.24 |
+37:58:55.4 |
HIP 82203 |
27.91 |
| 2026-08-10 00:00 |
16:46:36.11 |
+37:57:41.7 |
HIP 82203 |
26.99 |
| 2026-08-10 12:00 |
16:46:34.05 |
+37:56:27.7 |
HIP 82203 |
26.09 |
| 2026-08-11 00:00 |
16:46:32.06 |
+37:55:13.3 |
HIP 82203 |
25.21 |
| 2026-08-11 12:00 |
16:46:30.13 |
+37:53:58.6 |
HIP 82203 |
24.36 |
| 2026-08-12 00:00 |
16:46:28.28 |
+37:52:43.7 |
HIP 82203 |
23.54 |
| 2026-08-12 12:00 |
16:46:26.49 |
+37:51:28.4 |
HIP 82203 |
22.75 |
| 2026-08-13 00:00 |
16:46:24.77 |
+37:50:12.8 |
HIP 82203 |
22.00 |
| 2026-08-13 12:00 |
16:46:23.11 |
+37:48:56.9 |
HIP 82203 |
21.29 |
| 2026-08-14 00:00 |
16:46:21.53 |
+37:47:40.7 |
HIP 82203 |
20.62 |
| 2026-08-14 12:00 |
16:46:20.02 |
+37:46:24.2 |
HIP 82203 |
20.01 |
| 2026-08-15 00:00 |
16:46:18.57 |
+37:45:07.5 |
HIP 82203 |
19.45 |
| 2026-08-15 12:00 |
16:46:17.19 |
+37:43:50.5 |
HIP 82203 |
18.95 |
| 2026-08-16 00:00 |
16:46:15.89 |
+37:42:33.2 |
HIP 82203 |
18.51 |
| 2026-08-16 12:00 |
16:46:14.65 |
+37:41:15.7 |
HIP 82203 |
18.15 |
| 2026-08-17 00:00 |
16:46:13.48 |
+37:39:57.9 |
HIP 82203 |
17.86 |
| 2026-08-17 12:00 |
16:46:12.38 |
+37:38:39.9 |
HIP 82203 |
17.65 |
| 2026-08-18 00:00 |
16:46:11.35 |
+37:37:21.7 |
HIP 82096 |
16.37 |
| 2026-08-18 12:00 |
16:46:10.39 |
+37:36:03.2 |
HIP 82096 |
15.07 |
| 2026-08-19 00:00 |
16:46:09.50 |
+37:34:44.5 |
HIP 82096 |
13.76 |