| 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) |
| 2026-03-26 00:00 |
01:51:53.70 |
+21:35:32.1 |
HIP 8802 |
29.33 |
| 2026-03-26 12:00 |
01:52:18.77 |
+21:37:10.3 |
HIP 8802 |
24.85 |
| 2026-03-27 00:00 |
01:52:43.89 |
+21:38:49.0 |
HIP 8802 |
21.15 |
| 2026-03-27 12:00 |
01:53:09.07 |
+21:40:28.0 |
HIP 8802 |
18.72 |
| 2026-03-28 00:00 |
01:53:34.30 |
+21:42:07.5 |
HIP 8876 |
15.39 |
| 2026-03-28 12:00 |
01:53:59.57 |
+21:43:47.3 |
HIP 8876 |
10.64 |
| 2026-03-29 00:00 |
01:54:24.90 |
+21:45:27.6 |
HIP 8876 |
7.98 |
| 2026-03-29 12:00 |
01:54:50.28 |
+21:47:08.2 |
HIP 8876 |
9.43 |
| 2026-03-30 00:00 |
01:55:15.71 |
+21:48:49.3 |
HIP 8876 |
13.76 |
| 2026-03-30 12:00 |
01:55:41.19 |
+21:50:30.7 |
HIP 8876 |
19.12 |
| 2026-03-31 00:00 |
01:56:06.71 |
+21:52:12.5 |
HIP 8876 |
24.85 |
| 2026-03-31 12:00 |
01:56:32.29 |
+21:53:54.7 |
HIP 8876 |
30.76 |
| 2026-04-01 00:00 |
01:56:57.91 |
+21:55:37.2 |
HIP 9260 |
28.95 |
| 2026-04-01 12:00 |
01:57:23.58 |
+21:57:20.1 |
HIP 9260 |
23.12 |
| 2026-04-02 00:00 |
01:57:49.29 |
+21:59:03.4 |
HIP 9260 |
17.53 |
| 2026-04-02 12:00 |
01:58:15.05 |
+22:00:47.0 |
HIP 9260 |
12.54 |
| 2026-04-03 00:00 |
01:58:40.85 |
+22:02:30.9 |
HIP 9260 |
9.18 |
| 2026-04-03 12:00 |
01:59:06.70 |
+22:04:15.2 |
HIP 9260 |
9.45 |
| 2026-04-04 00:00 |
01:59:32.59 |
+22:05:59.9 |
HIP 9260 |
13.12 |
| 2026-04-04 12:00 |
01:59:58.53 |
+22:07:44.8 |
HIP 9293 |
17.95 |
| 2026-04-05 00:00 |
02:00:24.51 |
+22:09:30.1 |
HIP 9293 |
22.67 |
| 2026-04-05 12:00 |
02:00:50.53 |
+22:11:15.8 |
HIP 9492 |
18.44 |
| 2026-04-06 00:00 |
02:01:16.59 |
+22:13:01.7 |
HIP 9492 |
13.53 |
| 2026-04-06 12:00 |
02:01:42.70 |
+22:14:48.0 |
HIP 9492 |
10.25 |
| 2026-04-07 00:00 |
02:02:08.84 |
+22:16:34.6 |
HIP 9492 |
10.33 |
| 2026-04-07 12:00 |
02:02:35.03 |
+22:18:21.5 |
HIP 9492 |
13.71 |
| 2026-04-08 00:00 |
02:03:01.25 |
+22:20:08.6 |
HIP 9492 |
18.70 |
| 2026-04-08 12:00 |
02:03:27.52 |
+22:21:56.1 |
HIP 9492 |
24.32 |
| 2026-04-09 00:00 |
02:03:53.82 |
+22:23:43.9 |
HIP 9714 |
28.65 |
| 2026-04-09 12:00 |
02:04:20.16 |
+22:25:32.0 |
HIP 9714 |
24.32 |
| 2026-04-10 00:00 |
02:04:46.54 |
+22:27:20.3 |
HIP 9714 |
21.03 |
| 2026-04-10 12:00 |
02:05:12.96 |
+22:29:08.9 |
HIP 9714 |
19.33 |
| 2026-04-11 00:00 |
02:05:39.41 |
+22:30:57.8 |
HIP 9836 |
14.88 |
| 2026-04-11 12:00 |
02:06:05.90 |
+22:32:47.0 |
HIP 9836 |
8.90 |
| 2026-04-12 00:00 |
02:06:32.43 |
+22:34:36.4 |
HIP 9836 |
4.31 |
| 2026-04-12 12:00 |
02:06:58.99 |
+22:36:26.1 |
HIP 9836 |
6.29 |
| 2026-04-13 00:00 |
02:07:25.58 |
+22:38:16.1 |
HIP 9836 |
11.94 |
| 2026-04-13 12:00 |
02:07:52.21 |
+22:40:06.3 |
HIP 9836 |
18.10 |
| 2026-04-14 00:00 |
02:08:18.87 |
+22:41:56.7 |
HIP 10019 |
20.50 |
| 2026-04-14 12:00 |
02:08:45.56 |
+22:43:47.4 |
HIP 10019 |
20.17 |
| 2026-04-15 00:00 |
02:09:12.28 |
+22:45:38.3 |
HIP 10019 |
21.83 |
| 2026-04-15 12:00 |
02:09:39.04 |
+22:47:29.5 |
HIP 10019 |
25.08 |
| 2026-04-16 00:00 |
02:10:05.82 |
+22:49:20.9 |
HIP 10070 |
24.81 |