| Parameter |
Value |
| Designation |
P/2012 G1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-03-21T12:15:24.851520Z |
| Orbit solution date (soln_date, UTC) |
2022-03-08T19:43:47Z |
| Obs used |
22 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-04-16.0000000 |
| e |
0.32992923 |
| q (au) |
2.794694 |
| a (au) |
4.170744 |
| i (deg) |
12.171310 |
| Ω (om, deg) |
283.395321 |
| ω (w, deg) |
265.751864 |
| M (ma, deg) |
2.949454 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.018 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.018 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
02:52:00.21 |
+25:46:48.8 |
HIP 13433 |
20.16 |
| 2026-06-01 12:00 |
02:52:27.23 |
+25:48:43.8 |
HIP 13433 |
15.16 |
| 2026-06-02 00:00 |
02:52:54.22 |
+25:50:38.6 |
HIP 13433 |
11.60 |
| 2026-06-02 12:00 |
02:53:21.19 |
+25:52:33.4 |
HIP 13433 |
10.96 |
| 2026-06-03 00:00 |
02:53:48.13 |
+25:54:28.0 |
HIP 13433 |
13.66 |
| 2026-06-03 12:00 |
02:54:15.04 |
+25:56:22.5 |
HIP 13433 |
18.25 |
| 2026-06-04 00:00 |
02:54:41.93 |
+25:58:16.9 |
HIP 13672 |
19.94 |
| 2026-06-04 12:00 |
02:55:08.79 |
+26:00:11.2 |
HIP 13672 |
13.63 |
| 2026-06-05 00:00 |
02:55:35.61 |
+26:02:05.3 |
HIP 13672 |
7.36 |
| 2026-06-05 12:00 |
02:56:02.41 |
+26:03:59.4 |
HIP 13672 |
1.55 |
| 2026-06-06 00:00 |
02:56:29.18 |
+26:05:53.3 |
HIP 13672 |
5.50 |
| 2026-06-06 12:00 |
02:56:55.92 |
+26:07:47.0 |
HIP 13672 |
11.72 |
| 2026-06-07 00:00 |
02:57:22.62 |
+26:09:40.7 |
HIP 13672 |
17.98 |
| 2026-06-07 12:00 |
02:57:49.30 |
+26:11:34.2 |
HIP 13672 |
24.24 |
| 2026-06-08 00:00 |
02:58:15.94 |
+26:13:27.6 |
HIP 13672 |
30.50 |
| 2026-06-08 12:00 |
02:58:42.54 |
+26:15:20.8 |
HIP 13891 |
31.16 |
| 2026-06-09 00:00 |
02:59:09.11 |
+26:17:14.0 |
HIP 13891 |
29.43 |
| 2026-06-09 12:00 |
02:59:35.65 |
+26:19:06.9 |
HIP 13891 |
28.97 |
| 2026-06-10 00:00 |
03:00:02.15 |
+26:20:59.8 |
HIP 14109 |
25.97 |
| 2026-06-10 12:00 |
03:00:28.61 |
+26:22:52.4 |
HIP 14109 |
19.76 |
| 2026-06-11 00:00 |
03:00:55.04 |
+26:24:45.0 |
HIP 14109 |
13.57 |
| 2026-06-11 12:00 |
03:01:21.43 |
+26:26:37.4 |
HIP 14109 |
7.41 |
| 2026-06-12 00:00 |
03:01:47.78 |
+26:28:29.6 |
HIP 14109 |
1.61 |
| 2026-06-12 12:00 |
03:02:14.08 |
+26:30:21.7 |
HIP 14109 |
5.17 |
| 2026-06-13 00:00 |
03:02:40.35 |
+26:32:13.6 |
HIP 14150 |
5.42 |
| 2026-06-13 12:00 |
03:03:06.58 |
+26:34:05.3 |
HIP 14150 |
9.43 |
| 2026-06-14 00:00 |
03:03:32.76 |
+26:35:56.9 |
HIP 14150 |
14.96 |
| 2026-06-14 12:00 |
03:03:58.90 |
+26:37:48.3 |
HIP 14150 |
20.83 |
| 2026-06-15 00:00 |
03:04:25.00 |
+26:39:39.6 |
HIP 14150 |
26.80 |
| 2026-06-15 12:00 |
03:04:51.05 |
+26:41:30.7 |
HIP 14150 |
32.81 |
| 2026-06-16 00:00 |
03:05:17.05 |
+26:43:21.6 |
HIP 14150 |
38.84 |
| 2026-06-16 12:00 |
03:05:43.01 |
+26:45:12.3 |
HIP 14594 |
44.28 |
| 2026-06-17 00:00 |
03:06:08.92 |
+26:47:02.9 |
HIP 14594 |
40.85 |
| 2026-06-17 12:00 |
03:06:34.78 |
+26:48:53.3 |
HIP 14594 |
38.09 |
| 2026-06-18 00:00 |
03:07:00.59 |
+26:50:43.4 |
HIP 14594 |
36.16 |
| 2026-06-18 12:00 |
03:07:26.35 |
+26:52:33.4 |
HIP 14594 |
35.18 |
| 2026-06-19 00:00 |
03:07:52.06 |
+26:54:23.3 |
HIP 14748 |
34.56 |
| 2026-06-19 12:00 |
03:08:17.71 |
+26:56:12.9 |
HIP 14748 |
28.93 |
| 2026-06-20 00:00 |
03:08:43.32 |
+26:58:02.3 |
HIP 14748 |
23.51 |
| 2026-06-20 12:00 |
03:09:08.87 |
+26:59:51.6 |
HIP 14748 |
18.46 |
| 2026-06-21 00:00 |
03:09:34.37 |
+27:01:40.6 |
HIP 14748 |
14.16 |
| 2026-06-21 12:00 |
03:09:59.81 |
+27:03:29.5 |
HIP 14748 |
11.46 |
| 2026-06-22 00:00 |
03:10:25.20 |
+27:05:18.1 |
HIP 14748 |
11.54 |