| Parameter |
Value |
| Designation |
P/2012 F2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-04-10T00:22:20.953920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:05Z |
| Obs used |
100 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
8.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-12-31.0000000 |
| e |
0.54223975 |
| q (au) |
2.897068 |
| a (au) |
6.328788 |
| i (deg) |
14.724691 |
| Ω (om, deg) |
227.135164 |
| ω (w, deg) |
33.192840 |
| M (ma, deg) |
353.808575 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.654 + 3.510\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.654 |
| n |
3.510 |
| gf |
1.000 |
| gb |
-0.553 |
| 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) |
| 2026-03-26 00:00 |
08:07:24.42 |
+04:01:00.9 |
HIP 39786 |
6.36 |
| 2026-03-26 12:00 |
08:07:21.60 |
+04:02:12.6 |
HIP 39786 |
7.27 |
| 2026-03-27 00:00 |
08:07:18.94 |
+04:03:24.0 |
HIP 39786 |
8.27 |
| 2026-03-27 12:00 |
08:07:16.42 |
+04:04:35.1 |
HIP 39786 |
9.33 |
| 2026-03-28 00:00 |
08:07:14.05 |
+04:05:45.9 |
HIP 39786 |
10.43 |
| 2026-03-28 12:00 |
08:07:11.83 |
+04:06:56.4 |
HIP 39786 |
11.53 |
| 2026-03-29 00:00 |
08:07:09.76 |
+04:08:06.6 |
HIP 39786 |
12.64 |
| 2026-03-29 12:00 |
08:07:07.84 |
+04:09:16.4 |
HIP 39786 |
13.75 |
| 2026-03-30 00:00 |
08:07:06.07 |
+04:10:25.9 |
HIP 39786 |
14.84 |
| 2026-03-30 12:00 |
08:07:04.44 |
+04:11:35.1 |
HIP 39786 |
15.93 |
| 2026-03-31 00:00 |
08:07:02.97 |
+04:12:43.9 |
HIP 39786 |
17.01 |
| 2026-03-31 12:00 |
08:07:01.65 |
+04:13:52.3 |
HIP 39786 |
18.08 |
| 2026-04-01 00:00 |
08:07:00.47 |
+04:15:00.4 |
HIP 39786 |
19.13 |
| 2026-04-01 12:00 |
08:06:59.45 |
+04:16:08.2 |
HIP 39786 |
20.16 |
| 2026-04-02 00:00 |
08:06:58.57 |
+04:17:15.6 |
HIP 39786 |
21.18 |
| 2026-04-02 12:00 |
08:06:57.84 |
+04:18:22.6 |
HIP 39786 |
22.19 |
| 2026-04-03 00:00 |
08:06:57.27 |
+04:19:29.2 |
HIP 39786 |
23.18 |
| 2026-04-03 12:00 |
08:06:56.84 |
+04:20:35.4 |
HIP 39786 |
24.16 |
| 2026-04-04 00:00 |
08:06:56.56 |
+04:21:41.3 |
HIP 39786 |
25.12 |
| 2026-04-04 12:00 |
08:06:56.43 |
+04:22:46.7 |
HIP 39786 |
26.07 |
| 2026-04-05 00:00 |
08:06:56.45 |
+04:23:51.7 |
HIP 39786 |
27.01 |
| 2026-04-05 12:00 |
08:06:56.62 |
+04:24:56.4 |
HIP 39786 |
27.93 |
| 2026-04-06 00:00 |
08:06:56.94 |
+04:26:00.6 |
HIP 39786 |
28.84 |
| 2026-04-06 12:00 |
08:06:57.40 |
+04:27:04.4 |
HIP 39786 |
29.74 |
| 2026-04-07 00:00 |
08:06:58.02 |
+04:28:07.8 |
HIP 39786 |
30.62 |
| 2026-04-07 12:00 |
08:06:58.78 |
+04:29:10.7 |
HIP 39786 |
31.50 |
| 2026-04-08 00:00 |
08:06:59.69 |
+04:30:13.2 |
HIP 39786 |
32.37 |
| 2026-04-08 12:00 |
08:07:00.75 |
+04:31:15.3 |
HIP 39786 |
33.23 |
| 2026-04-09 00:00 |
08:07:01.96 |
+04:32:16.9 |
HIP 39786 |
34.08 |
| 2026-04-09 12:00 |
08:07:03.32 |
+04:33:18.0 |
HIP 39786 |
34.92 |
| 2026-04-10 00:00 |
08:07:04.83 |
+04:34:18.7 |
HIP 39786 |
35.76 |
| 2026-04-10 12:00 |
08:07:06.48 |
+04:35:19.0 |
HIP 39789 |
34.72 |
| 2026-04-11 00:00 |
08:07:08.28 |
+04:36:18.7 |
HIP 39789 |
33.63 |
| 2026-04-11 12:00 |
08:07:10.23 |
+04:37:18.0 |
HIP 39789 |
32.54 |
| 2026-04-12 00:00 |
08:07:12.33 |
+04:38:16.8 |
HIP 39789 |
31.45 |
| 2026-04-12 12:00 |
08:07:14.57 |
+04:39:15.2 |
HIP 39789 |
30.35 |
| 2026-04-13 00:00 |
08:07:16.96 |
+04:40:13.0 |
HIP 39789 |
29.25 |
| 2026-04-13 12:00 |
08:07:19.50 |
+04:41:10.4 |
HIP 39789 |
28.16 |
| 2026-04-14 00:00 |
08:07:22.18 |
+04:42:07.2 |
HIP 39789 |
27.07 |
| 2026-04-14 12:00 |
08:07:25.01 |
+04:43:03.5 |
HIP 39789 |
25.98 |
| 2026-04-15 00:00 |
08:07:27.99 |
+04:43:59.4 |
HIP 39789 |
24.90 |
| 2026-04-15 12:00 |
08:07:31.11 |
+04:44:54.7 |
HIP 39789 |
23.83 |
| 2026-04-16 00:00 |
08:07:34.38 |
+04:45:49.5 |
HIP 39789 |
22.78 |