| Parameter |
Value |
| Designation |
C/2011 U3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-06-03T21:30:23.644800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:56Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
14.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-11-08.0000000 |
| e |
1.00044923 |
| q (au) |
1.071437 |
| a (au) |
-2385.059256 |
| i (deg) |
116.775956 |
| Ω (om, deg) |
228.378920 |
| ω (w, deg) |
287.823893 |
| M (ma, deg) |
-0.001768 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.812 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.812 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.917 |
| k |
0.999 |
| 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 |
12:57:20.02 |
+68:01:18.3 |
HIP 63114 |
20.26 |
| 2026-06-01 12:00 |
12:57:14.56 |
+68:00:40.6 |
HIP 63114 |
19.49 |
| 2026-06-02 00:00 |
12:57:09.17 |
+68:00:02.5 |
HIP 63114 |
18.71 |
| 2026-06-02 12:00 |
12:57:03.86 |
+67:59:24.1 |
HIP 63114 |
17.93 |
| 2026-06-03 00:00 |
12:56:58.61 |
+67:58:45.5 |
HIP 63114 |
17.15 |
| 2026-06-03 12:00 |
12:56:53.43 |
+67:58:06.5 |
HIP 63114 |
16.38 |
| 2026-06-04 00:00 |
12:56:48.33 |
+67:57:27.3 |
HIP 63114 |
15.61 |
| 2026-06-04 12:00 |
12:56:43.29 |
+67:56:47.8 |
HIP 63114 |
14.83 |
| 2026-06-05 00:00 |
12:56:38.33 |
+67:56:08.0 |
HIP 63114 |
14.06 |
| 2026-06-05 12:00 |
12:56:33.44 |
+67:55:28.0 |
HIP 63114 |
13.30 |
| 2026-06-06 00:00 |
12:56:28.62 |
+67:54:47.7 |
HIP 63114 |
12.53 |
| 2026-06-06 12:00 |
12:56:23.87 |
+67:54:07.1 |
HIP 63114 |
11.77 |
| 2026-06-07 00:00 |
12:56:19.19 |
+67:53:26.3 |
HIP 63114 |
11.01 |
| 2026-06-07 12:00 |
12:56:14.59 |
+67:52:45.2 |
HIP 63114 |
10.26 |
| 2026-06-08 00:00 |
12:56:10.06 |
+67:52:03.8 |
HIP 63114 |
9.51 |
| 2026-06-08 12:00 |
12:56:05.60 |
+67:51:22.2 |
HIP 63114 |
8.77 |
| 2026-06-09 00:00 |
12:56:01.21 |
+67:50:40.4 |
HIP 63114 |
8.04 |
| 2026-06-09 12:00 |
12:55:56.90 |
+67:49:58.3 |
HIP 63114 |
7.32 |
| 2026-06-10 00:00 |
12:55:52.66 |
+67:49:15.9 |
HIP 63114 |
6.63 |
| 2026-06-10 12:00 |
12:55:48.50 |
+67:48:33.4 |
HIP 63114 |
5.95 |
| 2026-06-11 00:00 |
12:55:44.41 |
+67:47:50.6 |
HIP 63114 |
5.31 |
| 2026-06-11 12:00 |
12:55:40.39 |
+67:47:07.5 |
HIP 63114 |
4.72 |
| 2026-06-12 00:00 |
12:55:36.45 |
+67:46:24.3 |
HIP 63114 |
4.19 |
| 2026-06-12 12:00 |
12:55:32.58 |
+67:45:40.8 |
HIP 63114 |
3.76 |
| 2026-06-13 00:00 |
12:55:28.78 |
+67:44:57.1 |
HIP 63114 |
3.46 |
| 2026-06-13 12:00 |
12:55:25.06 |
+67:44:13.1 |
HIP 63114 |
3.33 |
| 2026-06-14 00:00 |
12:55:21.42 |
+67:43:29.0 |
HIP 63114 |
3.39 |
| 2026-06-14 12:00 |
12:55:17.85 |
+67:42:44.7 |
HIP 63114 |
3.63 |
| 2026-06-15 00:00 |
12:55:14.36 |
+67:42:00.1 |
HIP 63114 |
4.01 |
| 2026-06-15 12:00 |
12:55:10.94 |
+67:41:15.3 |
HIP 63114 |
4.50 |
| 2026-06-16 00:00 |
12:55:07.59 |
+67:40:30.4 |
HIP 63114 |
5.08 |
| 2026-06-16 12:00 |
12:55:04.32 |
+67:39:45.3 |
HIP 63114 |
5.70 |
| 2026-06-17 00:00 |
12:55:01.13 |
+67:39:00.0 |
HIP 63114 |
6.37 |
| 2026-06-17 12:00 |
12:54:58.02 |
+67:38:14.4 |
HIP 63114 |
7.06 |
| 2026-06-18 00:00 |
12:54:54.97 |
+67:37:28.7 |
HIP 63114 |
7.77 |
| 2026-06-18 12:00 |
12:54:52.01 |
+67:36:42.9 |
HIP 63114 |
8.50 |
| 2026-06-19 00:00 |
12:54:49.12 |
+67:35:56.8 |
HIP 63114 |
9.24 |
| 2026-06-19 12:00 |
12:54:46.31 |
+67:35:10.6 |
HIP 63114 |
9.99 |
| 2026-06-20 00:00 |
12:54:43.57 |
+67:34:24.2 |
HIP 63114 |
10.75 |
| 2026-06-20 12:00 |
12:54:40.90 |
+67:33:37.7 |
HIP 63114 |
11.51 |
| 2026-06-21 00:00 |
12:54:38.32 |
+67:32:51.0 |
HIP 63114 |
12.28 |
| 2026-06-21 12:00 |
12:54:35.81 |
+67:32:04.2 |
HIP 63114 |
13.05 |
| 2026-06-22 00:00 |
12:54:33.37 |
+67:31:17.2 |
HIP 63114 |
13.82 |