P/2014 M4 (PANSTARRS)
| Parameter |
Value |
| Designation |
P/2014 M4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-12-27T14:02:39.793920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:56Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-09-16.0000000 |
| e |
0.59553911 |
| q (au) |
2.351457 |
| a (au) |
5.813805 |
| i (deg) |
3.345156 |
| Ω (om, deg) |
265.062268 |
| ω (w, deg) |
145.270395 |
| M (ma, deg) |
352.787298 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.730 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.730 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
18:19:22.09 |
-23:01:58.1 |
HIP 89741 |
7.24 |
| 2026-02-03 12:00 |
18:19:39.69 |
-23:01:45.5 |
HIP 89741 |
11.23 |
| 2026-02-04 00:00 |
18:19:57.22 |
-23:01:32.8 |
HIP 89741 |
15.23 |
| 2026-02-04 12:00 |
18:20:14.69 |
-23:01:20.0 |
HIP 89741 |
19.24 |
| 2026-02-05 00:00 |
18:20:32.09 |
-23:01:07.1 |
HIP 90016 |
21.73 |
| 2026-02-05 12:00 |
18:20:49.43 |
-23:00:54.1 |
HIP 90016 |
17.84 |
| 2026-02-06 00:00 |
18:21:06.71 |
-23:00:41.0 |
HIP 90016 |
14.04 |
| 2026-02-06 12:00 |
18:21:23.92 |
-23:00:27.8 |
HIP 90016 |
10.38 |
| 2026-02-07 00:00 |
18:21:41.07 |
-23:00:14.5 |
HIP 90016 |
7.07 |
| 2026-02-07 12:00 |
18:21:58.14 |
-23:00:01.1 |
HIP 90016 |
4.85 |
| 2026-02-08 00:00 |
18:22:15.15 |
-22:59:47.6 |
HIP 90016 |
5.29 |
| 2026-02-08 12:00 |
18:22:32.10 |
-22:59:34.0 |
HIP 90016 |
7.94 |
| 2026-02-09 00:00 |
18:22:48.97 |
-22:59:20.4 |
HIP 90016 |
11.32 |
| 2026-02-09 12:00 |
18:23:05.77 |
-22:59:06.6 |
HIP 90016 |
14.94 |
| 2026-02-10 00:00 |
18:23:22.50 |
-22:58:52.7 |
HIP 90016 |
18.64 |
| 2026-02-10 12:00 |
18:23:39.16 |
-22:58:38.8 |
HIP 90016 |
22.38 |
| 2026-02-11 00:00 |
18:23:55.74 |
-22:58:24.7 |
HIP 90321 |
25.72 |
| 2026-02-11 12:00 |
18:24:12.25 |
-22:58:10.6 |
HIP 90321 |
22.13 |
| 2026-02-12 00:00 |
18:24:28.69 |
-22:57:56.4 |
HIP 90321 |
18.65 |
| 2026-02-12 12:00 |
18:24:45.05 |
-22:57:42.1 |
HIP 90321 |
15.32 |
| 2026-02-13 00:00 |
18:25:01.33 |
-22:57:27.7 |
HIP 90321 |
12.28 |
| 2026-02-13 12:00 |
18:25:17.54 |
-22:57:13.3 |
HIP 90321 |
9.76 |
| 2026-02-14 00:00 |
18:25:33.67 |
-22:56:58.8 |
HIP 90321 |
8.22 |
| 2026-02-14 12:00 |
18:25:49.72 |
-22:56:44.2 |
HIP 90321 |
8.22 |
| 2026-02-15 00:00 |
18:26:05.69 |
-22:56:29.5 |
HIP 90321 |
9.74 |
| 2026-02-15 12:00 |
18:26:21.58 |
-22:56:14.8 |
HIP 90321 |
12.21 |
| 2026-02-16 00:00 |
18:26:37.39 |
-22:56:00.0 |
HIP 90321 |
15.15 |
| 2026-02-16 12:00 |
18:26:53.12 |
-22:55:45.2 |
HIP 90513 |
17.54 |
| 2026-02-17 00:00 |
18:27:08.76 |
-22:55:30.2 |
HIP 90513 |
14.15 |
| 2026-02-17 12:00 |
18:27:24.32 |
-22:55:15.3 |
HIP 90513 |
10.92 |
| 2026-02-18 00:00 |
18:27:39.80 |
-22:55:00.2 |
HIP 90513 |
8.02 |
| 2026-02-18 12:00 |
18:27:55.19 |
-22:54:45.1 |
HIP 90513 |
5.90 |
| 2026-02-19 00:00 |
18:28:10.49 |
-22:54:30.0 |
HIP 90513 |
5.54 |
| 2026-02-19 12:00 |
18:28:25.70 |
-22:54:14.8 |
HIP 90513 |
7.16 |
| 2026-02-20 00:00 |
18:28:40.83 |
-22:53:59.5 |
HIP 90513 |
9.81 |
| 2026-02-20 12:00 |
18:28:55.87 |
-22:53:44.3 |
HIP 90513 |
12.85 |
| 2026-02-21 00:00 |
18:29:10.82 |
-22:53:28.9 |
HIP 90513 |
16.05 |
| 2026-02-21 12:00 |
18:29:25.67 |
-22:53:13.5 |
HIP 90513 |
19.31 |
| 2026-02-22 00:00 |
18:29:40.44 |
-22:52:58.1 |
HIP 90513 |
22.61 |
| 2026-02-22 12:00 |
18:29:55.11 |
-22:52:42.7 |
HIP 90713 |
23.66 |
| 2026-02-23 00:00 |
18:30:09.69 |
-22:52:27.2 |
HIP 90713 |
23.02 |
| 2026-02-23 12:00 |
18:30:24.18 |
-22:52:11.6 |
HIP 90713 |
22.87 |
| 2026-02-24 00:00 |
18:30:38.57 |
-22:51:56.1 |
HIP 90713 |
23.20 |