| 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 |
-0.773 |
| 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) |
| 2026-05-12 00:00 |
02:33:45.28 |
+24:29:10.0 |
HIP 11993 |
27.25 |
| 2026-05-12 12:00 |
02:34:12.83 |
+24:31:07.1 |
HIP 11993 |
23.20 |
| 2026-05-13 00:00 |
02:34:40.37 |
+24:33:04.3 |
HIP 11993 |
20.50 |
| 2026-05-13 12:00 |
02:35:07.92 |
+24:35:01.4 |
HIP 11993 |
19.70 |
| 2026-05-14 00:00 |
02:35:35.47 |
+24:36:58.6 |
HIP 12184 |
18.77 |
| 2026-05-14 12:00 |
02:36:03.01 |
+24:38:55.7 |
HIP 12184 |
12.41 |
| 2026-05-15 00:00 |
02:36:30.55 |
+24:40:52.9 |
HIP 12184 |
6.47 |
| 2026-05-15 12:00 |
02:36:58.09 |
+24:42:50.0 |
HIP 12184 |
3.95 |
| 2026-05-16 00:00 |
02:37:25.62 |
+24:44:47.1 |
HIP 12189 |
8.25 |
| 2026-05-16 12:00 |
02:37:53.14 |
+24:46:44.2 |
HIP 12189 |
14.34 |
| 2026-05-17 00:00 |
02:38:20.66 |
+24:48:41.3 |
HIP 12189 |
20.71 |
| 2026-05-17 12:00 |
02:38:48.18 |
+24:50:38.4 |
HIP 12189 |
27.16 |
| 2026-05-18 00:00 |
02:39:15.68 |
+24:52:35.4 |
HIP 12532 |
28.49 |
| 2026-05-18 12:00 |
02:39:43.18 |
+24:54:32.5 |
HIP 12532 |
23.53 |
| 2026-05-19 00:00 |
02:40:10.67 |
+24:56:29.4 |
HIP 12532 |
19.52 |
| 2026-05-19 12:00 |
02:40:38.15 |
+24:58:26.4 |
HIP 12532 |
17.15 |
| 2026-05-20 00:00 |
02:41:05.62 |
+25:00:23.3 |
HIP 12532 |
17.10 |
| 2026-05-20 12:00 |
02:41:33.08 |
+25:02:20.1 |
HIP 12532 |
19.39 |
| 2026-05-21 00:00 |
02:42:00.53 |
+25:04:16.9 |
HIP 12532 |
23.34 |
| 2026-05-21 12:00 |
02:42:27.96 |
+25:06:13.7 |
HIP 12532 |
28.25 |
| 2026-05-22 00:00 |
02:42:55.38 |
+25:08:10.4 |
HIP 12781 |
29.42 |
| 2026-05-22 12:00 |
02:43:22.79 |
+25:10:07.0 |
HIP 12781 |
24.38 |
| 2026-05-23 00:00 |
02:43:50.18 |
+25:12:03.6 |
HIP 12781 |
20.19 |
| 2026-05-23 12:00 |
02:44:17.56 |
+25:14:00.1 |
HIP 12781 |
17.46 |
| 2026-05-24 00:00 |
02:44:44.93 |
+25:15:56.6 |
HIP 12781 |
16.92 |
| 2026-05-24 12:00 |
02:45:12.27 |
+25:17:53.0 |
HIP 12781 |
18.76 |
| 2026-05-25 00:00 |
02:45:39.61 |
+25:19:49.3 |
HIP 12926 |
20.79 |
| 2026-05-25 12:00 |
02:46:06.92 |
+25:21:45.5 |
HIP 12926 |
17.35 |
| 2026-05-26 00:00 |
02:46:34.22 |
+25:23:41.7 |
HIP 12926 |
15.92 |
| 2026-05-26 12:00 |
02:47:01.50 |
+25:25:37.8 |
HIP 12926 |
17.00 |
| 2026-05-27 00:00 |
02:47:28.76 |
+25:27:33.8 |
HIP 13109 |
17.58 |
| 2026-05-27 12:00 |
02:47:56.00 |
+25:29:29.7 |
HIP 13109 |
14.45 |
| 2026-05-28 00:00 |
02:48:23.22 |
+25:31:25.5 |
HIP 13109 |
13.85 |
| 2026-05-28 12:00 |
02:48:50.42 |
+25:33:21.3 |
HIP 13109 |
16.05 |
| 2026-05-29 00:00 |
02:49:17.60 |
+25:35:16.9 |
HIP 13224 |
19.85 |
| 2026-05-29 12:00 |
02:49:44.76 |
+25:37:12.5 |
HIP 13224 |
18.40 |
| 2026-05-30 00:00 |
02:50:11.90 |
+25:39:07.9 |
HIP 13224 |
19.12 |
| 2026-05-30 12:00 |
02:50:39.01 |
+25:41:03.3 |
HIP 13224 |
21.79 |
| 2026-05-31 00:00 |
02:51:06.10 |
+25:42:58.6 |
HIP 13224 |
25.80 |
| 2026-05-31 12:00 |
02:51:33.17 |
+25:44:53.7 |
HIP 13433 |
25.78 |
| 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 |