| Parameter |
Value |
| Designation |
P/2014 U4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-08-03T22:12:56.600640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:01Z |
| Obs used |
61 |
| NEO |
- |
| M1 |
19.100 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-10-27.0000000 |
| e |
0.47100403 |
| q (au) |
1.843417 |
| a (au) |
3.484747 |
| i (deg) |
6.456987 |
| Ω (om, deg) |
12.045421 |
| ω (w, deg) |
347.730100 |
| M (ma, deg) |
12.738279 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.883 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.883 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.634 |
| k |
0.800 |
| 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 |
15:23:54.52 |
-24:40:16.6 |
HIP 75403 |
14.12 |
| 2026-05-12 12:00 |
15:23:29.19 |
-24:39:19.5 |
HIP 75403 |
18.41 |
| 2026-05-13 00:00 |
15:23:03.80 |
-24:38:21.4 |
HIP 75242 |
21.61 |
| 2026-05-13 12:00 |
15:22:38.37 |
-24:37:22.3 |
HIP 75242 |
19.26 |
| 2026-05-14 00:00 |
15:22:12.89 |
-24:36:22.3 |
HIP 75242 |
18.53 |
| 2026-05-14 12:00 |
15:21:47.37 |
-24:35:21.4 |
HIP 75242 |
19.61 |
| 2026-05-15 00:00 |
15:21:21.83 |
-24:34:19.6 |
HIP 75242 |
22.25 |
| 2026-05-15 12:00 |
15:20:56.25 |
-24:33:16.8 |
HIP 75012 |
24.29 |
| 2026-05-16 00:00 |
15:20:30.66 |
-24:32:13.1 |
HIP 75012 |
19.69 |
| 2026-05-16 12:00 |
15:20:05.05 |
-24:31:08.6 |
HIP 75012 |
15.97 |
| 2026-05-17 00:00 |
15:19:39.43 |
-24:30:03.2 |
HIP 75012 |
13.86 |
| 2026-05-17 12:00 |
15:19:13.81 |
-24:28:57.0 |
HIP 75012 |
14.12 |
| 2026-05-18 00:00 |
15:18:48.19 |
-24:27:49.9 |
HIP 74920 |
13.18 |
| 2026-05-18 12:00 |
15:18:22.58 |
-24:26:42.0 |
HIP 74850 |
8.58 |
| 2026-05-19 00:00 |
15:17:56.99 |
-24:25:33.4 |
HIP 74850 |
2.70 |
| 2026-05-19 12:00 |
15:17:31.41 |
-24:24:23.9 |
HIP 74850 |
3.39 |
| 2026-05-20 00:00 |
15:17:05.85 |
-24:23:13.7 |
HIP 74830 |
8.55 |
| 2026-05-20 12:00 |
15:16:40.33 |
-24:22:02.8 |
HIP 74830 |
14.07 |
| 2026-05-21 00:00 |
15:16:14.84 |
-24:20:51.2 |
HIP 74830 |
19.82 |
| 2026-05-21 12:00 |
15:15:49.39 |
-24:19:38.8 |
HIP 74830 |
25.65 |
| 2026-05-22 00:00 |
15:15:23.99 |
-24:18:25.8 |
HIP 74540 |
20.95 |
| 2026-05-22 12:00 |
15:14:58.63 |
-24:17:12.1 |
HIP 74540 |
15.73 |
| 2026-05-23 00:00 |
15:14:33.34 |
-24:15:57.8 |
HIP 74540 |
11.23 |
| 2026-05-23 12:00 |
15:14:08.11 |
-24:14:42.9 |
HIP 74540 |
8.63 |
| 2026-05-24 00:00 |
15:13:42.94 |
-24:13:27.3 |
HIP 74540 |
9.60 |
| 2026-05-24 12:00 |
15:13:17.85 |
-24:12:11.2 |
HIP 74490 |
11.69 |
| 2026-05-25 00:00 |
15:12:52.83 |
-24:10:54.6 |
HIP 74490 |
11.83 |
| 2026-05-25 12:00 |
15:12:27.90 |
-24:09:37.3 |
HIP 74490 |
14.53 |
| 2026-05-26 00:00 |
15:12:03.05 |
-24:08:19.6 |
HIP 74490 |
18.70 |
| 2026-05-26 12:00 |
15:11:38.29 |
-24:07:01.4 |
HIP 74490 |
23.55 |
| 2026-05-27 00:00 |
15:11:13.63 |
-24:05:42.7 |
HIP 74206 |
19.91 |
| 2026-05-27 12:00 |
15:10:49.07 |
-24:04:23.5 |
HIP 74206 |
14.19 |
| 2026-05-28 00:00 |
15:10:24.62 |
-24:03:03.9 |
HIP 74206 |
8.55 |
| 2026-05-28 12:00 |
15:10:00.28 |
-24:01:43.9 |
HIP 74206 |
3.29 |
| 2026-05-29 00:00 |
15:09:36.05 |
-24:00:23.6 |
HIP 74206 |
3.70 |
| 2026-05-29 12:00 |
15:09:11.95 |
-23:59:02.8 |
HIP 74206 |
8.99 |
| 2026-05-30 00:00 |
15:08:47.97 |
-23:57:41.7 |
HIP 74206 |
14.54 |
| 2026-05-30 12:00 |
15:08:24.11 |
-23:56:20.3 |
HIP 74206 |
20.12 |
| 2026-05-31 00:00 |
15:08:00.39 |
-23:54:58.5 |
HIP 73992 |
19.44 |
| 2026-05-31 12:00 |
15:07:36.81 |
-23:53:36.5 |
HIP 73992 |
18.61 |
| 2026-06-01 00:00 |
15:07:13.38 |
-23:52:14.2 |
HIP 73992 |
19.41 |
| 2026-06-01 12:00 |
15:06:50.08 |
-23:50:51.7 |
HIP 73896 |
19.25 |
| 2026-06-02 00:00 |
15:06:26.94 |
-23:49:29.0 |
HIP 73830 |
15.56 |