C/2015 V4 (PANSTARRS)
| 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
$$
M_a = (6.198 + 4.797\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.198 |
| 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) |
| 2026-02-03 00:00 |
17:05:44.37 |
+34:28:22.8 |
HIP 83459 |
29.00 |
| 2026-02-03 12:00 |
17:05:50.54 |
+34:29:36.7 |
HIP 83494 |
29.92 |
| 2026-02-04 00:00 |
17:05:56.67 |
+34:30:51.0 |
HIP 83494 |
30.24 |
| 2026-02-04 12:00 |
17:06:02.73 |
+34:32:05.8 |
HIP 83494 |
30.65 |
| 2026-02-05 00:00 |
17:06:08.74 |
+34:33:21.1 |
HIP 83494 |
31.14 |
| 2026-02-05 12:00 |
17:06:14.69 |
+34:34:36.8 |
HIP 83494 |
31.70 |
| 2026-02-06 00:00 |
17:06:20.58 |
+34:35:53.0 |
HIP 83494 |
32.33 |
| 2026-02-06 12:00 |
17:06:26.41 |
+34:37:09.6 |
HIP 83494 |
33.03 |
| 2026-02-07 00:00 |
17:06:32.18 |
+34:38:26.7 |
HIP 83494 |
33.80 |
| 2026-02-07 12:00 |
17:06:37.90 |
+34:39:44.2 |
HIP 83872 |
32.28 |
| 2026-02-08 00:00 |
17:06:43.55 |
+34:41:02.1 |
HIP 83872 |
30.54 |
| 2026-02-08 12:00 |
17:06:49.15 |
+34:42:20.5 |
HIP 83872 |
28.81 |
| 2026-02-09 00:00 |
17:06:54.68 |
+34:43:39.3 |
HIP 83872 |
27.08 |
| 2026-02-09 12:00 |
17:07:00.16 |
+34:44:58.5 |
HIP 83872 |
25.36 |
| 2026-02-10 00:00 |
17:07:05.57 |
+34:46:18.1 |
HIP 83872 |
23.65 |
| 2026-02-10 12:00 |
17:07:10.92 |
+34:47:38.1 |
HIP 83872 |
21.94 |
| 2026-02-11 00:00 |
17:07:16.21 |
+34:48:58.6 |
HIP 83872 |
20.24 |
| 2026-02-11 12:00 |
17:07:21.44 |
+34:50:19.4 |
HIP 83872 |
18.56 |
| 2026-02-12 00:00 |
17:07:26.60 |
+34:51:40.6 |
HIP 83872 |
16.88 |
| 2026-02-12 12:00 |
17:07:31.70 |
+34:53:02.2 |
HIP 83872 |
15.23 |
| 2026-02-13 00:00 |
17:07:36.74 |
+34:54:24.2 |
HIP 83872 |
13.60 |
| 2026-02-13 12:00 |
17:07:41.71 |
+34:55:46.6 |
HIP 83872 |
12.00 |
| 2026-02-14 00:00 |
17:07:46.62 |
+34:57:09.3 |
HIP 83872 |
10.44 |
| 2026-02-14 12:00 |
17:07:51.47 |
+34:58:32.4 |
HIP 83872 |
8.95 |
| 2026-02-15 00:00 |
17:07:56.25 |
+34:59:55.9 |
HIP 83872 |
7.56 |
| 2026-02-15 12:00 |
17:08:00.97 |
+35:01:19.7 |
HIP 83872 |
6.33 |
| 2026-02-16 00:00 |
17:08:05.62 |
+35:02:43.8 |
HIP 83872 |
5.39 |
| 2026-02-16 12:00 |
17:08:10.20 |
+35:04:08.3 |
HIP 83872 |
4.88 |
| 2026-02-17 00:00 |
17:08:14.72 |
+35:05:33.2 |
HIP 83872 |
4.95 |
| 2026-02-17 12:00 |
17:08:19.17 |
+35:06:58.4 |
HIP 83872 |
5.57 |
| 2026-02-18 00:00 |
17:08:23.56 |
+35:08:23.9 |
HIP 83872 |
6.59 |
| 2026-02-18 12:00 |
17:08:27.88 |
+35:09:49.7 |
HIP 83872 |
7.84 |
| 2026-02-19 00:00 |
17:08:32.13 |
+35:11:15.8 |
HIP 83872 |
9.24 |
| 2026-02-19 12:00 |
17:08:36.31 |
+35:12:42.2 |
HIP 83872 |
10.72 |
| 2026-02-20 00:00 |
17:08:40.43 |
+35:14:09.0 |
HIP 83872 |
12.26 |
| 2026-02-20 12:00 |
17:08:44.48 |
+35:15:36.0 |
HIP 83872 |
13.82 |
| 2026-02-21 00:00 |
17:08:48.46 |
+35:17:03.3 |
HIP 83872 |
15.42 |
| 2026-02-21 12:00 |
17:08:52.37 |
+35:18:30.9 |
HIP 83872 |
17.02 |
| 2026-02-22 00:00 |
17:08:56.21 |
+35:19:58.8 |
HIP 83872 |
18.64 |
| 2026-02-22 12:00 |
17:08:59.98 |
+35:21:26.9 |
HIP 83872 |
20.26 |
| 2026-02-23 00:00 |
17:09:03.69 |
+35:22:55.3 |
HIP 83872 |
21.89 |
| 2026-02-23 12:00 |
17:09:07.32 |
+35:24:24.0 |
HIP 84043 |
22.85 |
| 2026-02-24 00:00 |
17:09:10.89 |
+35:25:52.9 |
HIP 84043 |
21.74 |