| 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) |
| 2026-03-26 00:00 |
15:50:11.53 |
-24:48:58.1 |
HIP 77545 |
20.26 |
| 2026-03-26 12:00 |
15:50:06.80 |
-24:49:39.0 |
HIP 77545 |
19.47 |
| 2026-03-27 00:00 |
15:50:01.77 |
-24:50:19.2 |
HIP 77545 |
18.74 |
| 2026-03-27 12:00 |
15:49:56.46 |
-24:50:58.5 |
HIP 77545 |
18.10 |
| 2026-03-28 00:00 |
15:49:50.86 |
-24:51:36.9 |
HIP 77545 |
17.56 |
| 2026-03-28 12:00 |
15:49:44.96 |
-24:52:14.6 |
HIP 77545 |
17.15 |
| 2026-03-29 00:00 |
15:49:38.78 |
-24:52:51.4 |
HIP 77545 |
16.88 |
| 2026-03-29 12:00 |
15:49:32.30 |
-24:53:27.3 |
HIP 77545 |
16.80 |
| 2026-03-30 00:00 |
15:49:25.54 |
-24:54:02.4 |
HIP 77545 |
16.90 |
| 2026-03-30 12:00 |
15:49:18.49 |
-24:54:36.7 |
HIP 77545 |
17.21 |
| 2026-03-31 00:00 |
15:49:11.15 |
-24:55:10.1 |
HIP 77545 |
17.73 |
| 2026-03-31 12:00 |
15:49:03.51 |
-24:55:42.6 |
HIP 77545 |
18.46 |
| 2026-04-01 00:00 |
15:48:55.59 |
-24:56:14.2 |
HIP 77545 |
19.39 |
| 2026-04-01 12:00 |
15:48:47.38 |
-24:56:44.9 |
HIP 77399 |
19.01 |
| 2026-04-02 00:00 |
15:48:38.88 |
-24:57:14.8 |
HIP 77399 |
17.63 |
| 2026-04-02 12:00 |
15:48:30.09 |
-24:57:43.7 |
HIP 77399 |
16.37 |
| 2026-04-03 00:00 |
15:48:21.01 |
-24:58:11.7 |
HIP 77399 |
15.27 |
| 2026-04-03 12:00 |
15:48:11.64 |
-24:58:38.8 |
HIP 77399 |
14.41 |
| 2026-04-04 00:00 |
15:48:01.98 |
-24:59:05.0 |
HIP 77399 |
13.85 |
| 2026-04-04 12:00 |
15:47:52.03 |
-24:59:30.3 |
HIP 77399 |
13.67 |
| 2026-04-05 00:00 |
15:47:41.80 |
-24:59:54.6 |
HIP 77399 |
13.90 |
| 2026-04-05 12:00 |
15:47:31.28 |
-25:00:17.9 |
HIP 77399 |
14.57 |
| 2026-04-06 00:00 |
15:47:20.47 |
-25:00:40.3 |
HIP 77399 |
15.63 |
| 2026-04-06 12:00 |
15:47:09.38 |
-25:01:01.7 |
HIP 77399 |
17.05 |
| 2026-04-07 00:00 |
15:46:58.00 |
-25:01:22.2 |
HIP 77399 |
18.77 |
| 2026-04-07 12:00 |
15:46:46.34 |
-25:01:41.7 |
HIP 77164 |
18.80 |
| 2026-04-08 00:00 |
15:46:34.39 |
-25:02:00.2 |
HIP 77164 |
16.08 |
| 2026-04-08 12:00 |
15:46:22.16 |
-25:02:17.7 |
HIP 77164 |
13.29 |
| 2026-04-09 00:00 |
15:46:09.65 |
-25:02:34.2 |
HIP 77164 |
10.45 |
| 2026-04-09 12:00 |
15:45:56.86 |
-25:02:49.7 |
HIP 77164 |
7.54 |
| 2026-04-10 00:00 |
15:45:43.78 |
-25:03:04.2 |
HIP 77164 |
4.57 |
| 2026-04-10 12:00 |
15:45:30.43 |
-25:03:17.6 |
HIP 77164 |
1.54 |
| 2026-04-11 00:00 |
15:45:16.80 |
-25:03:30.1 |
HIP 77164 |
1.58 |
| 2026-04-11 12:00 |
15:45:02.89 |
-25:03:41.4 |
HIP 77164 |
4.72 |
| 2026-04-12 00:00 |
15:44:48.71 |
-25:03:51.8 |
HIP 77164 |
7.94 |
| 2026-04-12 12:00 |
15:44:34.25 |
-25:04:01.1 |
HIP 77164 |
11.22 |
| 2026-04-13 00:00 |
15:44:19.52 |
-25:04:09.3 |
HIP 77164 |
14.56 |
| 2026-04-13 12:00 |
15:44:04.52 |
-25:04:16.5 |
HIP 77164 |
17.95 |
| 2026-04-14 00:00 |
15:43:49.25 |
-25:04:22.6 |
HIP 77164 |
21.41 |
| 2026-04-14 12:00 |
15:43:33.72 |
-25:04:27.6 |
HIP 76988 |
21.08 |
| 2026-04-15 00:00 |
15:43:17.92 |
-25:04:31.6 |
HIP 76988 |
20.46 |
| 2026-04-15 12:00 |
15:43:01.85 |
-25:04:34.4 |
HIP 76988 |
20.48 |
| 2026-04-16 00:00 |
15:42:45.53 |
-25:04:36.2 |
HIP 76988 |
21.16 |