| Parameter |
Value |
| Designation |
C/2012 U1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-07-04T17:20:39.560640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:25Z |
| Obs used |
172 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-12-31.0000000 |
| e |
0.99956488 |
| q (au) |
5.263903 |
| a (au) |
12097.722849 |
| i (deg) |
56.339020 |
| Ω (om, deg) |
26.982573 |
| ω (w, deg) |
70.049903 |
| M (ma, deg) |
359.999862 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.230 + 5.910\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.230 |
| n |
5.910 |
| gf |
1.000 |
| gb |
-0.501 |
| 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) |
| 2026-06-01 00:00 |
13:48:31.15 |
-25:39:27.2 |
HIP 67490 |
25.27 |
| 2026-06-01 12:00 |
13:48:27.56 |
-25:39:06.0 |
HIP 67490 |
25.58 |
| 2026-06-02 00:00 |
13:48:23.99 |
-25:38:44.7 |
HIP 67490 |
25.92 |
| 2026-06-02 12:00 |
13:48:20.46 |
-25:38:23.5 |
HIP 67490 |
26.28 |
| 2026-06-03 00:00 |
13:48:16.96 |
-25:38:02.4 |
HIP 67490 |
26.66 |
| 2026-06-03 12:00 |
13:48:13.49 |
-25:37:41.3 |
HIP 67490 |
27.06 |
| 2026-06-04 00:00 |
13:48:10.05 |
-25:37:20.2 |
HIP 67490 |
27.47 |
| 2026-06-04 12:00 |
13:48:06.64 |
-25:36:59.1 |
HIP 67490 |
27.90 |
| 2026-06-05 00:00 |
13:48:03.26 |
-25:36:38.1 |
HIP 67490 |
28.33 |
| 2026-06-05 12:00 |
13:47:59.92 |
-25:36:17.2 |
HIP 67490 |
28.79 |
| 2026-06-06 00:00 |
13:47:56.60 |
-25:35:56.3 |
HIP 67490 |
29.25 |
| 2026-06-06 12:00 |
13:47:53.32 |
-25:35:35.4 |
HIP 67490 |
29.72 |
| 2026-06-07 00:00 |
13:47:50.08 |
-25:35:14.6 |
HIP 67490 |
30.20 |
| 2026-06-07 12:00 |
13:47:46.86 |
-25:34:53.9 |
HIP 67490 |
30.69 |
| 2026-06-08 00:00 |
13:47:43.68 |
-25:34:33.2 |
HIP 67490 |
31.18 |
| 2026-06-08 12:00 |
13:47:40.53 |
-25:34:12.6 |
HIP 67490 |
31.69 |
| 2026-06-09 00:00 |
13:47:37.42 |
-25:33:52.0 |
HIP 67490 |
32.19 |
| 2026-06-09 12:00 |
13:47:34.34 |
-25:33:31.5 |
HIP 67490 |
32.70 |
| 2026-06-10 00:00 |
13:47:31.29 |
-25:33:11.1 |
HIP 67490 |
33.22 |
| 2026-06-10 12:00 |
13:47:28.28 |
-25:32:50.7 |
HIP 67490 |
33.73 |
| 2026-06-11 00:00 |
13:47:25.30 |
-25:32:30.4 |
HIP 67490 |
34.25 |
| 2026-06-11 12:00 |
13:47:22.36 |
-25:32:10.2 |
HIP 67490 |
34.77 |
| 2026-06-12 00:00 |
13:47:19.45 |
-25:31:50.1 |
HIP 67071 |
34.73 |
| 2026-06-12 12:00 |
13:47:16.58 |
-25:31:30.0 |
HIP 67071 |
34.07 |
| 2026-06-13 00:00 |
13:47:13.74 |
-25:31:10.1 |
HIP 67071 |
33.42 |
| 2026-06-13 12:00 |
13:47:10.94 |
-25:30:50.2 |
HIP 67071 |
32.78 |
| 2026-06-14 00:00 |
13:47:08.17 |
-25:30:30.4 |
HIP 67071 |
32.15 |
| 2026-06-14 12:00 |
13:47:05.44 |
-25:30:10.7 |
HIP 67071 |
31.53 |
| 2026-06-15 00:00 |
13:47:02.75 |
-25:29:51.0 |
HIP 67071 |
30.92 |
| 2026-06-15 12:00 |
13:47:00.09 |
-25:29:31.5 |
HIP 67071 |
30.33 |
| 2026-06-16 00:00 |
13:46:57.47 |
-25:29:12.1 |
HIP 67071 |
29.75 |
| 2026-06-16 12:00 |
13:46:54.88 |
-25:28:52.7 |
HIP 67071 |
29.18 |
| 2026-06-17 00:00 |
13:46:52.34 |
-25:28:33.5 |
HIP 67071 |
28.62 |
| 2026-06-17 12:00 |
13:46:49.83 |
-25:28:14.4 |
HIP 67071 |
28.07 |
| 2026-06-18 00:00 |
13:46:47.35 |
-25:27:55.4 |
HIP 67071 |
27.54 |
| 2026-06-18 12:00 |
13:46:44.92 |
-25:27:36.4 |
HIP 67071 |
27.02 |
| 2026-06-19 00:00 |
13:46:42.52 |
-25:27:17.6 |
HIP 67071 |
26.51 |
| 2026-06-19 12:00 |
13:46:40.16 |
-25:26:58.9 |
HIP 67071 |
26.01 |
| 2026-06-20 00:00 |
13:46:37.84 |
-25:26:40.4 |
HIP 67071 |
25.53 |
| 2026-06-20 12:00 |
13:46:35.55 |
-25:26:21.9 |
HIP 67071 |
25.07 |
| 2026-06-21 00:00 |
13:46:33.31 |
-25:26:03.6 |
HIP 67071 |
24.61 |
| 2026-06-21 12:00 |
13:46:31.10 |
-25:25:45.3 |
HIP 67071 |
24.17 |
| 2026-06-22 00:00 |
13:46:28.93 |
-25:25:27.2 |
HIP 67071 |
23.75 |