| 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 |
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 |
13:18:57.85 |
+44:29:06.8 |
HIP 64758 |
31.89 |
| 2026-07-29 12:00 |
13:18:59.15 |
+44:27:58.5 |
HIP 64758 |
32.62 |
| 2026-07-30 00:00 |
13:19:00.51 |
+44:26:50.2 |
HIP 65189 |
32.50 |
| 2026-07-30 12:00 |
13:19:01.92 |
+44:25:42.0 |
HIP 65189 |
31.68 |
| 2026-07-31 00:00 |
13:19:03.37 |
+44:24:33.8 |
HIP 65189 |
30.88 |
| 2026-07-31 12:00 |
13:19:04.88 |
+44:23:25.6 |
HIP 65189 |
30.09 |
| 2026-08-01 00:00 |
13:19:06.43 |
+44:22:17.5 |
HIP 65189 |
29.33 |
| 2026-08-01 12:00 |
13:19:08.03 |
+44:21:09.4 |
HIP 65135 |
28.54 |
| 2026-08-02 00:00 |
13:19:09.68 |
+44:20:01.4 |
HIP 65135 |
27.50 |
| 2026-08-02 12:00 |
13:19:11.38 |
+44:18:53.4 |
HIP 65135 |
26.45 |
| 2026-08-03 00:00 |
13:19:13.13 |
+44:17:45.4 |
HIP 65135 |
25.41 |
| 2026-08-03 12:00 |
13:19:14.93 |
+44:16:37.5 |
HIP 65135 |
24.38 |
| 2026-08-04 00:00 |
13:19:16.77 |
+44:15:29.7 |
HIP 65135 |
23.36 |
| 2026-08-04 12:00 |
13:19:18.66 |
+44:14:22.0 |
HIP 65135 |
22.34 |
| 2026-08-05 00:00 |
13:19:20.60 |
+44:13:14.3 |
HIP 65135 |
21.34 |
| 2026-08-05 12:00 |
13:19:22.59 |
+44:12:06.7 |
HIP 65135 |
20.35 |
| 2026-08-06 00:00 |
13:19:24.62 |
+44:10:59.1 |
HIP 65135 |
19.37 |
| 2026-08-06 12:00 |
13:19:26.70 |
+44:09:51.7 |
HIP 65135 |
18.42 |
| 2026-08-07 00:00 |
13:19:28.83 |
+44:08:44.3 |
HIP 65135 |
17.48 |
| 2026-08-07 12:00 |
13:19:31.00 |
+44:07:37.0 |
HIP 65135 |
16.57 |
| 2026-08-08 00:00 |
13:19:33.22 |
+44:06:29.8 |
HIP 65135 |
15.69 |
| 2026-08-08 12:00 |
13:19:35.48 |
+44:05:22.7 |
HIP 65135 |
14.85 |
| 2026-08-09 00:00 |
13:19:37.80 |
+44:04:15.7 |
HIP 65135 |
14.05 |
| 2026-08-09 12:00 |
13:19:40.15 |
+44:03:08.8 |
HIP 65135 |
13.30 |
| 2026-08-10 00:00 |
13:19:42.56 |
+44:02:02.0 |
HIP 65135 |
12.61 |
| 2026-08-10 12:00 |
13:19:45.00 |
+44:00:55.3 |
HIP 65135 |
11.99 |
| 2026-08-11 00:00 |
13:19:47.50 |
+43:59:48.7 |
HIP 65135 |
11.45 |
| 2026-08-11 12:00 |
13:19:50.03 |
+43:58:42.2 |
HIP 65135 |
11.01 |
| 2026-08-12 00:00 |
13:19:52.62 |
+43:57:35.9 |
HIP 65135 |
10.68 |
| 2026-08-12 12:00 |
13:19:55.24 |
+43:56:29.7 |
HIP 65135 |
10.47 |
| 2026-08-13 00:00 |
13:19:57.91 |
+43:55:23.6 |
HIP 65135 |
10.38 |
| 2026-08-13 12:00 |
13:20:00.63 |
+43:54:17.7 |
HIP 65135 |
10.43 |
| 2026-08-14 00:00 |
13:20:03.38 |
+43:53:11.9 |
HIP 65135 |
10.60 |
| 2026-08-14 12:00 |
13:20:06.19 |
+43:52:06.2 |
HIP 65135 |
10.90 |
| 2026-08-15 00:00 |
13:20:09.03 |
+43:51:00.7 |
HIP 65135 |
11.31 |
| 2026-08-15 12:00 |
13:20:11.92 |
+43:49:55.3 |
HIP 65135 |
11.83 |
| 2026-08-16 00:00 |
13:20:14.84 |
+43:48:50.1 |
HIP 65135 |
12.43 |
| 2026-08-16 12:00 |
13:20:17.81 |
+43:47:45.0 |
HIP 65135 |
13.11 |
| 2026-08-17 00:00 |
13:20:20.83 |
+43:46:40.1 |
HIP 65135 |
13.86 |
| 2026-08-17 12:00 |
13:20:23.88 |
+43:45:35.4 |
HIP 65135 |
14.66 |
| 2026-08-18 00:00 |
13:20:26.97 |
+43:44:30.8 |
HIP 65135 |
15.52 |
| 2026-08-18 12:00 |
13:20:30.11 |
+43:43:26.4 |
HIP 65135 |
16.41 |
| 2026-08-19 00:00 |
13:20:33.29 |
+43:42:22.2 |
HIP 65135 |
17.34 |