| 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) |
| 2026-05-12 00:00 |
13:26:24.29 |
+46:49:01.7 |
HIP 65627 |
9.21 |
| 2026-05-12 12:00 |
13:26:17.72 |
+46:48:37.7 |
HIP 65627 |
10.35 |
| 2026-05-13 00:00 |
13:26:11.18 |
+46:48:13.0 |
HIP 65627 |
11.50 |
| 2026-05-13 12:00 |
13:26:04.67 |
+46:47:47.8 |
HIP 65627 |
12.65 |
| 2026-05-14 00:00 |
13:25:58.20 |
+46:47:22.1 |
HIP 65627 |
13.80 |
| 2026-05-14 12:00 |
13:25:51.77 |
+46:46:55.8 |
HIP 65627 |
14.95 |
| 2026-05-15 00:00 |
13:25:45.37 |
+46:46:29.0 |
HIP 65627 |
16.11 |
| 2026-05-15 12:00 |
13:25:39.00 |
+46:46:01.6 |
HIP 65627 |
17.26 |
| 2026-05-16 00:00 |
13:25:32.67 |
+46:45:33.7 |
HIP 65627 |
18.42 |
| 2026-05-16 12:00 |
13:25:26.38 |
+46:45:05.3 |
HIP 65457 |
18.50 |
| 2026-05-17 00:00 |
13:25:20.12 |
+46:44:36.3 |
HIP 65457 |
17.75 |
| 2026-05-17 12:00 |
13:25:13.90 |
+46:44:06.8 |
HIP 65457 |
17.05 |
| 2026-05-18 00:00 |
13:25:07.72 |
+46:43:36.8 |
HIP 65457 |
16.40 |
| 2026-05-18 12:00 |
13:25:01.58 |
+46:43:06.2 |
HIP 65457 |
15.80 |
| 2026-05-19 00:00 |
13:24:55.48 |
+46:42:35.1 |
HIP 65457 |
15.25 |
| 2026-05-19 12:00 |
13:24:49.42 |
+46:42:03.5 |
HIP 65457 |
14.77 |
| 2026-05-20 00:00 |
13:24:43.39 |
+46:41:31.4 |
HIP 65457 |
14.35 |
| 2026-05-20 12:00 |
13:24:37.41 |
+46:40:58.7 |
HIP 65457 |
14.02 |
| 2026-05-21 00:00 |
13:24:31.47 |
+46:40:25.6 |
HIP 65457 |
13.76 |
| 2026-05-21 12:00 |
13:24:25.57 |
+46:39:51.9 |
HIP 65457 |
13.59 |
| 2026-05-22 00:00 |
13:24:19.71 |
+46:39:17.8 |
HIP 65457 |
13.50 |
| 2026-05-22 12:00 |
13:24:13.89 |
+46:38:43.1 |
HIP 65457 |
13.50 |
| 2026-05-23 00:00 |
13:24:08.11 |
+46:38:07.9 |
HIP 65457 |
13.59 |
| 2026-05-23 12:00 |
13:24:02.38 |
+46:37:32.3 |
HIP 65457 |
13.77 |
| 2026-05-24 00:00 |
13:23:56.69 |
+46:36:56.1 |
HIP 65457 |
14.02 |
| 2026-05-24 12:00 |
13:23:51.04 |
+46:36:19.5 |
HIP 65457 |
14.36 |
| 2026-05-25 00:00 |
13:23:45.44 |
+46:35:42.4 |
HIP 65457 |
14.76 |
| 2026-05-25 12:00 |
13:23:39.87 |
+46:35:04.8 |
HIP 65457 |
15.23 |
| 2026-05-26 00:00 |
13:23:34.36 |
+46:34:26.7 |
HIP 65457 |
15.76 |
| 2026-05-26 12:00 |
13:23:28.89 |
+46:33:48.2 |
HIP 65457 |
16.34 |
| 2026-05-27 00:00 |
13:23:23.46 |
+46:33:09.1 |
HIP 65457 |
16.97 |
| 2026-05-27 12:00 |
13:23:18.08 |
+46:32:29.6 |
HIP 65457 |
17.64 |
| 2026-05-28 00:00 |
13:23:12.74 |
+46:31:49.7 |
HIP 65457 |
18.35 |
| 2026-05-28 12:00 |
13:23:07.45 |
+46:31:09.3 |
HIP 65457 |
19.09 |
| 2026-05-29 00:00 |
13:23:02.20 |
+46:30:28.4 |
HIP 65457 |
19.86 |
| 2026-05-29 12:00 |
13:22:57.00 |
+46:29:47.1 |
HIP 65457 |
20.65 |
| 2026-05-30 00:00 |
13:22:51.85 |
+46:29:05.3 |
HIP 65457 |
21.47 |
| 2026-05-30 12:00 |
13:22:46.74 |
+46:28:23.0 |
HIP 65326 |
21.82 |
| 2026-05-31 00:00 |
13:22:41.69 |
+46:27:40.4 |
HIP 65326 |
21.39 |
| 2026-05-31 12:00 |
13:22:36.67 |
+46:26:57.2 |
HIP 65326 |
21.01 |
| 2026-06-01 00:00 |
13:22:31.71 |
+46:26:13.7 |
HIP 65326 |
20.67 |
| 2026-06-01 12:00 |
13:22:26.79 |
+46:25:29.7 |
HIP 65326 |
20.37 |
| 2026-06-02 00:00 |
13:22:21.93 |
+46:24:45.3 |
HIP 65326 |
20.13 |