| Parameter |
Value |
| Designation |
P/2014 W4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-29T12:04:50.476800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:02Z |
| Obs used |
91 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
15.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-14.0000000 |
| e |
0.35307752 |
| q (au) |
4.261090 |
| a (au) |
6.586710 |
| i (deg) |
15.274347 |
| Ω (om, deg) |
33.352591 |
| ω (w, deg) |
67.411788 |
| M (ma, deg) |
353.790386 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.548 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.548 |
| 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) |
| 2026-06-01 00:00 |
21:05:22.93 |
-33:45:43.9 |
HIP 103975 |
33.56 |
| 2026-06-01 12:00 |
21:05:20.35 |
-33:46:47.6 |
HIP 103975 |
34.21 |
| 2026-06-02 00:00 |
21:05:17.64 |
-33:47:51.6 |
HIP 103975 |
34.88 |
| 2026-06-02 12:00 |
21:05:14.79 |
-33:48:55.9 |
HIP 103975 |
35.57 |
| 2026-06-03 00:00 |
21:05:11.81 |
-33:50:00.6 |
HIP 103975 |
36.28 |
| 2026-06-03 12:00 |
21:05:08.71 |
-33:51:05.5 |
HIP 103975 |
37.01 |
| 2026-06-04 00:00 |
21:05:05.46 |
-33:52:10.8 |
HIP 103975 |
37.77 |
| 2026-06-04 12:00 |
21:05:02.09 |
-33:53:16.3 |
HIP 103975 |
38.54 |
| 2026-06-05 00:00 |
21:04:58.59 |
-33:54:22.1 |
HIP 103975 |
39.35 |
| 2026-06-05 12:00 |
21:04:54.96 |
-33:55:28.2 |
HIP 103780 |
38.66 |
| 2026-06-06 00:00 |
21:04:51.19 |
-33:56:34.5 |
HIP 103780 |
37.79 |
| 2026-06-06 12:00 |
21:04:47.29 |
-33:57:41.1 |
HIP 103780 |
36.92 |
| 2026-06-07 00:00 |
21:04:43.27 |
-33:58:48.0 |
HIP 103780 |
36.05 |
| 2026-06-07 12:00 |
21:04:39.11 |
-33:59:55.1 |
HIP 103780 |
35.20 |
| 2026-06-08 00:00 |
21:04:34.83 |
-34:01:02.4 |
HIP 103780 |
34.35 |
| 2026-06-08 12:00 |
21:04:30.41 |
-34:02:10.0 |
HIP 103780 |
33.52 |
| 2026-06-09 00:00 |
21:04:25.86 |
-34:03:17.8 |
HIP 103780 |
32.70 |
| 2026-06-09 12:00 |
21:04:21.19 |
-34:04:25.8 |
HIP 103780 |
31.91 |
| 2026-06-10 00:00 |
21:04:16.38 |
-34:05:34.0 |
HIP 103780 |
31.14 |
| 2026-06-10 12:00 |
21:04:11.45 |
-34:06:42.5 |
HIP 103780 |
30.41 |
| 2026-06-11 00:00 |
21:04:06.39 |
-34:07:51.1 |
HIP 103780 |
29.71 |
| 2026-06-11 12:00 |
21:04:01.20 |
-34:08:59.9 |
HIP 103780 |
29.05 |
| 2026-06-12 00:00 |
21:03:55.88 |
-34:10:08.9 |
HIP 103780 |
28.44 |
| 2026-06-12 12:00 |
21:03:50.44 |
-34:11:18.0 |
HIP 103780 |
27.89 |
| 2026-06-13 00:00 |
21:03:44.86 |
-34:12:27.3 |
HIP 103780 |
27.40 |
| 2026-06-13 12:00 |
21:03:39.17 |
-34:13:36.8 |
HIP 103780 |
26.98 |
| 2026-06-14 00:00 |
21:03:33.34 |
-34:14:46.4 |
HIP 103780 |
26.64 |
| 2026-06-14 12:00 |
21:03:27.39 |
-34:15:56.2 |
HIP 103780 |
26.38 |
| 2026-06-15 00:00 |
21:03:21.32 |
-34:17:06.0 |
HIP 103780 |
26.21 |
| 2026-06-15 12:00 |
21:03:15.12 |
-34:18:16.0 |
HIP 103780 |
26.14 |
| 2026-06-16 00:00 |
21:03:08.80 |
-34:19:26.1 |
HIP 103780 |
26.16 |
| 2026-06-16 12:00 |
21:03:02.35 |
-34:20:36.3 |
HIP 103780 |
26.29 |
| 2026-06-17 00:00 |
21:02:55.79 |
-34:21:46.6 |
HIP 103780 |
26.53 |
| 2026-06-17 12:00 |
21:02:49.10 |
-34:22:56.9 |
HIP 103860 |
25.85 |
| 2026-06-18 00:00 |
21:02:42.29 |
-34:24:07.3 |
HIP 103860 |
24.63 |
| 2026-06-18 12:00 |
21:02:35.36 |
-34:25:17.8 |
HIP 103860 |
23.48 |
| 2026-06-19 00:00 |
21:02:28.31 |
-34:26:28.3 |
HIP 103860 |
22.43 |
| 2026-06-19 12:00 |
21:02:21.14 |
-34:27:38.9 |
HIP 103860 |
21.50 |
| 2026-06-20 00:00 |
21:02:13.86 |
-34:28:49.5 |
HIP 103860 |
20.70 |
| 2026-06-20 12:00 |
21:02:06.45 |
-34:30:00.2 |
HIP 103860 |
20.06 |
| 2026-06-21 00:00 |
21:01:58.94 |
-34:31:10.8 |
HIP 103860 |
19.59 |
| 2026-06-21 12:00 |
21:01:51.30 |
-34:32:21.4 |
HIP 103860 |
19.33 |
| 2026-06-22 00:00 |
21:01:43.55 |
-34:33:32.1 |
HIP 103860 |
19.28 |