| Parameter |
Value |
| Designation |
C/2015 V3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-11-24T20:48:06.068160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:16Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
15.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-01-24.0000000 |
| e |
0.99484386 |
| q (au) |
4.235691 |
| a (au) |
821.484531 |
| i (deg) |
86.231771 |
| Ω (om, deg) |
2.340885 |
| ω (w, deg) |
0.821275 |
| M (ma, deg) |
0.002517 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.207 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.207 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.501 |
| 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) |
| 2026-03-26 00:00 |
13:37:51.70 |
+46:43:32.5 |
HIP 66315 |
26.47 |
| 2026-03-26 12:00 |
13:37:44.54 |
+46:44:02.6 |
HIP 66315 |
25.54 |
| 2026-03-27 00:00 |
13:37:37.36 |
+46:44:32.2 |
HIP 66315 |
24.63 |
| 2026-03-27 12:00 |
13:37:30.16 |
+46:45:01.2 |
HIP 66315 |
23.76 |
| 2026-03-28 00:00 |
13:37:22.93 |
+46:45:29.7 |
HIP 66315 |
22.92 |
| 2026-03-28 12:00 |
13:37:15.68 |
+46:45:57.7 |
HIP 66315 |
22.12 |
| 2026-03-29 00:00 |
13:37:08.42 |
+46:46:25.1 |
HIP 66315 |
21.37 |
| 2026-03-29 12:00 |
13:37:01.13 |
+46:46:52.0 |
HIP 66315 |
20.67 |
| 2026-03-30 00:00 |
13:36:53.83 |
+46:47:18.4 |
HIP 66315 |
20.02 |
| 2026-03-30 12:00 |
13:36:46.51 |
+46:47:44.2 |
HIP 66315 |
19.44 |
| 2026-03-31 00:00 |
13:36:39.17 |
+46:48:09.5 |
HIP 66315 |
18.92 |
| 2026-03-31 12:00 |
13:36:31.82 |
+46:48:34.2 |
HIP 66315 |
18.47 |
| 2026-04-01 00:00 |
13:36:24.45 |
+46:48:58.4 |
HIP 66315 |
18.10 |
| 2026-04-01 12:00 |
13:36:17.06 |
+46:49:22.0 |
HIP 66315 |
17.81 |
| 2026-04-02 00:00 |
13:36:09.66 |
+46:49:45.1 |
HIP 66315 |
17.61 |
| 2026-04-02 12:00 |
13:36:02.24 |
+46:50:07.7 |
HIP 66315 |
17.50 |
| 2026-04-03 00:00 |
13:35:54.81 |
+46:50:29.6 |
HIP 66315 |
17.48 |
| 2026-04-03 12:00 |
13:35:47.37 |
+46:50:51.1 |
HIP 66315 |
17.55 |
| 2026-04-04 00:00 |
13:35:39.92 |
+46:51:11.9 |
HIP 66315 |
17.71 |
| 2026-04-04 12:00 |
13:35:32.45 |
+46:51:32.2 |
HIP 66315 |
17.95 |
| 2026-04-05 00:00 |
13:35:24.97 |
+46:51:52.0 |
HIP 66315 |
18.28 |
| 2026-04-05 12:00 |
13:35:17.49 |
+46:52:11.1 |
HIP 66151 |
18.23 |
| 2026-04-06 00:00 |
13:35:09.99 |
+46:52:29.7 |
HIP 66151 |
17.07 |
| 2026-04-06 12:00 |
13:35:02.48 |
+46:52:47.8 |
HIP 66151 |
15.93 |
| 2026-04-07 00:00 |
13:34:54.96 |
+46:53:05.2 |
HIP 66151 |
14.82 |
| 2026-04-07 12:00 |
13:34:47.44 |
+46:53:22.1 |
HIP 66151 |
13.74 |
| 2026-04-08 00:00 |
13:34:39.90 |
+46:53:38.4 |
HIP 66151 |
12.69 |
| 2026-04-08 12:00 |
13:34:32.37 |
+46:53:54.2 |
HIP 66151 |
11.70 |
| 2026-04-09 00:00 |
13:34:24.82 |
+46:54:09.3 |
HIP 66151 |
10.76 |
| 2026-04-09 12:00 |
13:34:17.27 |
+46:54:23.9 |
HIP 66151 |
9.91 |
| 2026-04-10 00:00 |
13:34:09.71 |
+46:54:37.9 |
HIP 66151 |
9.16 |
| 2026-04-10 12:00 |
13:34:02.15 |
+46:54:51.3 |
HIP 66151 |
8.54 |
| 2026-04-11 00:00 |
13:33:54.58 |
+46:55:04.2 |
HIP 66151 |
8.07 |
| 2026-04-11 12:00 |
13:33:47.01 |
+46:55:16.4 |
HIP 66151 |
7.79 |
| 2026-04-12 00:00 |
13:33:39.44 |
+46:55:28.1 |
HIP 66151 |
7.72 |
| 2026-04-12 12:00 |
13:33:31.87 |
+46:55:39.1 |
HIP 66151 |
7.85 |
| 2026-04-13 00:00 |
13:33:24.30 |
+46:55:49.6 |
HIP 66151 |
8.19 |
| 2026-04-13 12:00 |
13:33:16.72 |
+46:55:59.5 |
HIP 66151 |
8.70 |
| 2026-04-14 00:00 |
13:33:09.15 |
+46:56:08.8 |
HIP 66151 |
9.36 |
| 2026-04-14 12:00 |
13:33:01.57 |
+46:56:17.5 |
HIP 66151 |
10.14 |
| 2026-04-15 00:00 |
13:32:54.00 |
+46:56:25.6 |
HIP 66151 |
11.00 |
| 2026-04-15 12:00 |
13:32:46.43 |
+46:56:33.1 |
HIP 66151 |
11.94 |
| 2026-04-16 00:00 |
13:32:38.86 |
+46:56:40.0 |
HIP 66151 |
12.94 |