| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
18:42:08.49 |
-22:25:32.0 |
HIP 91826 |
16.61 |
| 2026-05-12 12:00 |
18:42:01.35 |
-22:25:31.9 |
HIP 91826 |
18.25 |
| 2026-05-13 00:00 |
18:41:54.06 |
-22:25:31.9 |
HIP 91826 |
19.94 |
| 2026-05-13 12:00 |
18:41:46.61 |
-22:25:32.0 |
HIP 91826 |
21.66 |
| 2026-05-14 00:00 |
18:41:39.02 |
-22:25:32.3 |
HIP 91826 |
23.41 |
| 2026-05-14 12:00 |
18:41:31.27 |
-22:25:32.7 |
HIP 91550 |
23.40 |
| 2026-05-15 00:00 |
18:41:23.38 |
-22:25:33.3 |
HIP 91550 |
21.98 |
| 2026-05-15 12:00 |
18:41:15.34 |
-22:25:33.9 |
HIP 91550 |
20.59 |
| 2026-05-16 00:00 |
18:41:07.15 |
-22:25:34.7 |
HIP 91550 |
19.26 |
| 2026-05-16 12:00 |
18:40:58.81 |
-22:25:35.7 |
HIP 91550 |
18.01 |
| 2026-05-17 00:00 |
18:40:50.33 |
-22:25:36.7 |
HIP 91550 |
16.87 |
| 2026-05-17 12:00 |
18:40:41.70 |
-22:25:37.8 |
HIP 91550 |
15.87 |
| 2026-05-18 00:00 |
18:40:32.93 |
-22:25:39.1 |
HIP 91550 |
15.05 |
| 2026-05-18 12:00 |
18:40:24.01 |
-22:25:40.5 |
HIP 91550 |
14.47 |
| 2026-05-19 00:00 |
18:40:14.96 |
-22:25:42.0 |
HIP 91550 |
14.16 |
| 2026-05-19 12:00 |
18:40:05.76 |
-22:25:43.6 |
HIP 91550 |
14.15 |
| 2026-05-20 00:00 |
18:39:56.42 |
-22:25:45.3 |
HIP 91550 |
14.47 |
| 2026-05-20 12:00 |
18:39:46.94 |
-22:25:47.1 |
HIP 91550 |
15.10 |
| 2026-05-21 00:00 |
18:39:37.33 |
-22:25:49.1 |
HIP 91550 |
16.03 |
| 2026-05-21 12:00 |
18:39:27.57 |
-22:25:51.1 |
HIP 91550 |
17.20 |
| 2026-05-22 00:00 |
18:39:17.68 |
-22:25:53.2 |
HIP 91550 |
18.60 |
| 2026-05-22 12:00 |
18:39:07.66 |
-22:25:55.4 |
HIP 91550 |
20.18 |
| 2026-05-23 00:00 |
18:38:57.50 |
-22:25:57.8 |
HIP 91550 |
21.92 |
| 2026-05-23 12:00 |
18:38:47.22 |
-22:26:00.2 |
HIP 91550 |
23.78 |
| 2026-05-24 00:00 |
18:38:36.79 |
-22:26:02.7 |
HIP 91550 |
25.75 |
| 2026-05-24 12:00 |
18:38:26.24 |
-22:26:05.3 |
HIP 91550 |
27.82 |
| 2026-05-25 00:00 |
18:38:15.56 |
-22:26:07.9 |
HIP 91550 |
29.97 |
| 2026-05-25 12:00 |
18:38:04.76 |
-22:26:10.7 |
HIP 91550 |
32.19 |
| 2026-05-26 00:00 |
18:37:53.82 |
-22:26:13.5 |
HIP 91550 |
34.47 |
| 2026-05-26 12:00 |
18:37:42.76 |
-22:26:16.4 |
HIP 91550 |
36.81 |
| 2026-05-27 00:00 |
18:37:31.58 |
-22:26:19.4 |
HIP 91130 |
36.82 |
| 2026-05-27 12:00 |
18:37:20.27 |
-22:26:22.4 |
HIP 91130 |
34.72 |
| 2026-05-28 00:00 |
18:37:08.84 |
-22:26:25.6 |
HIP 91130 |
32.69 |
| 2026-05-28 12:00 |
18:36:57.29 |
-22:26:28.8 |
HIP 91130 |
30.72 |
| 2026-05-29 00:00 |
18:36:45.62 |
-22:26:32.0 |
HIP 91130 |
28.85 |
| 2026-05-29 12:00 |
18:36:33.84 |
-22:26:35.3 |
HIP 91083 |
26.77 |
| 2026-05-30 00:00 |
18:36:21.93 |
-22:26:38.7 |
HIP 91083 |
24.09 |
| 2026-05-30 12:00 |
18:36:09.91 |
-22:26:42.2 |
HIP 91083 |
21.40 |
| 2026-05-31 00:00 |
18:35:57.78 |
-22:26:45.7 |
HIP 91083 |
18.71 |
| 2026-05-31 12:00 |
18:35:45.53 |
-22:26:49.2 |
HIP 91083 |
16.04 |
| 2026-06-01 00:00 |
18:35:33.17 |
-22:26:52.8 |
HIP 91083 |
13.40 |
| 2026-06-01 12:00 |
18:35:20.71 |
-22:26:56.5 |
HIP 91083 |
10.86 |
| 2026-06-02 00:00 |
18:35:08.13 |
-22:27:00.1 |
HIP 91083 |
8.52 |