| 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) |
| 2026-05-12 00:00 |
21:05:17.48 |
-33:08:40.4 |
HIP 103975 |
18.20 |
| 2026-05-12 12:00 |
21:05:20.20 |
-33:09:26.9 |
HIP 103975 |
18.37 |
| 2026-05-13 00:00 |
21:05:22.78 |
-33:10:14.0 |
HIP 103975 |
18.57 |
| 2026-05-13 12:00 |
21:05:25.23 |
-33:11:01.6 |
HIP 103975 |
18.78 |
| 2026-05-14 00:00 |
21:05:27.55 |
-33:11:49.7 |
HIP 103975 |
19.01 |
| 2026-05-14 12:00 |
21:05:29.74 |
-33:12:38.3 |
HIP 103975 |
19.25 |
| 2026-05-15 00:00 |
21:05:31.80 |
-33:13:27.4 |
HIP 103975 |
19.51 |
| 2026-05-15 12:00 |
21:05:33.73 |
-33:14:17.0 |
HIP 103975 |
19.77 |
| 2026-05-16 00:00 |
21:05:35.53 |
-33:15:07.1 |
HIP 103975 |
20.05 |
| 2026-05-16 12:00 |
21:05:37.19 |
-33:15:57.7 |
HIP 103975 |
20.34 |
| 2026-05-17 00:00 |
21:05:38.72 |
-33:16:48.8 |
HIP 103975 |
20.63 |
| 2026-05-17 12:00 |
21:05:40.12 |
-33:17:40.3 |
HIP 103975 |
20.93 |
| 2026-05-18 00:00 |
21:05:41.39 |
-33:18:32.4 |
HIP 103975 |
21.24 |
| 2026-05-18 12:00 |
21:05:42.52 |
-33:19:24.9 |
HIP 103975 |
21.56 |
| 2026-05-19 00:00 |
21:05:43.52 |
-33:20:17.9 |
HIP 103975 |
21.88 |
| 2026-05-19 12:00 |
21:05:44.39 |
-33:21:11.4 |
HIP 103975 |
22.21 |
| 2026-05-20 00:00 |
21:05:45.13 |
-33:22:05.3 |
HIP 103975 |
22.55 |
| 2026-05-20 12:00 |
21:05:45.73 |
-33:22:59.6 |
HIP 103975 |
22.89 |
| 2026-05-21 00:00 |
21:05:46.20 |
-33:23:54.5 |
HIP 103975 |
23.24 |
| 2026-05-21 12:00 |
21:05:46.54 |
-33:24:49.7 |
HIP 103975 |
23.60 |
| 2026-05-22 00:00 |
21:05:46.74 |
-33:25:45.4 |
HIP 103975 |
23.96 |
| 2026-05-22 12:00 |
21:05:46.81 |
-33:26:41.6 |
HIP 103975 |
24.33 |
| 2026-05-23 00:00 |
21:05:46.75 |
-33:27:38.2 |
HIP 103975 |
24.71 |
| 2026-05-23 12:00 |
21:05:46.56 |
-33:28:35.2 |
HIP 103975 |
25.10 |
| 2026-05-24 00:00 |
21:05:46.23 |
-33:29:32.6 |
HIP 103975 |
25.49 |
| 2026-05-24 12:00 |
21:05:45.77 |
-33:30:30.4 |
HIP 103975 |
25.90 |
| 2026-05-25 00:00 |
21:05:45.18 |
-33:31:28.6 |
HIP 103975 |
26.31 |
| 2026-05-25 12:00 |
21:05:44.45 |
-33:32:27.3 |
HIP 103975 |
26.74 |
| 2026-05-26 00:00 |
21:05:43.59 |
-33:33:26.3 |
HIP 103975 |
27.18 |
| 2026-05-26 12:00 |
21:05:42.60 |
-33:34:25.8 |
HIP 103975 |
27.63 |
| 2026-05-27 00:00 |
21:05:41.47 |
-33:35:25.6 |
HIP 103975 |
28.09 |
| 2026-05-27 12:00 |
21:05:40.22 |
-33:36:25.8 |
HIP 103975 |
28.57 |
| 2026-05-28 00:00 |
21:05:38.83 |
-33:37:26.4 |
HIP 103975 |
29.05 |
| 2026-05-28 12:00 |
21:05:37.30 |
-33:38:27.3 |
HIP 103975 |
29.56 |
| 2026-05-29 00:00 |
21:05:35.65 |
-33:39:28.6 |
HIP 103975 |
30.08 |
| 2026-05-29 12:00 |
21:05:33.86 |
-33:40:30.3 |
HIP 103975 |
30.62 |
| 2026-05-30 00:00 |
21:05:31.94 |
-33:41:32.3 |
HIP 103975 |
31.17 |
| 2026-05-30 12:00 |
21:05:29.88 |
-33:42:34.7 |
HIP 103975 |
31.74 |
| 2026-05-31 00:00 |
21:05:27.70 |
-33:43:37.4 |
HIP 103975 |
32.33 |
| 2026-05-31 12:00 |
21:05:25.38 |
-33:44:40.5 |
HIP 103975 |
32.93 |
| 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 |