| Parameter |
Value |
| Designation |
C/2012 S3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-31T03:14:37.167360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:22Z |
| Obs used |
730 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-22.0000000 |
| e |
1.00070829 |
| q (au) |
2.308066 |
| a (au) |
-3258.643490 |
| i (deg) |
112.930798 |
| Ω (om, deg) |
121.305818 |
| ω (w, deg) |
183.752733 |
| M (ma, deg) |
-0.000536 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.451 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.451 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
08:27:41.59 |
-08:05:36.4 |
HIP 41499 |
2.21 |
| 2026-06-01 12:00 |
08:27:43.85 |
-08:05:17.0 |
HIP 41499 |
1.60 |
| 2026-06-02 00:00 |
08:27:46.14 |
-08:04:57.9 |
HIP 41499 |
1.04 |
| 2026-06-02 12:00 |
08:27:48.45 |
-08:04:38.9 |
HIP 41499 |
0.67 |
| 2026-06-03 00:00 |
08:27:50.79 |
-08:04:20.2 |
HIP 41499 |
0.81 |
| 2026-06-03 12:00 |
08:27:53.15 |
-08:04:01.7 |
HIP 41499 |
1.31 |
| 2026-06-04 00:00 |
08:27:55.53 |
-08:03:43.5 |
HIP 41499 |
1.92 |
| 2026-06-04 12:00 |
08:27:57.94 |
-08:03:25.5 |
HIP 41499 |
2.55 |
| 2026-06-05 00:00 |
08:28:00.38 |
-08:03:07.8 |
HIP 41499 |
3.20 |
| 2026-06-05 12:00 |
08:28:02.84 |
-08:02:50.3 |
HIP 41499 |
3.86 |
| 2026-06-06 00:00 |
08:28:05.32 |
-08:02:33.0 |
HIP 41499 |
4.53 |
| 2026-06-06 12:00 |
08:28:07.83 |
-08:02:16.0 |
HIP 41499 |
5.20 |
| 2026-06-07 00:00 |
08:28:10.36 |
-08:01:59.2 |
HIP 41499 |
5.88 |
| 2026-06-07 12:00 |
08:28:12.92 |
-08:01:42.6 |
HIP 41499 |
6.56 |
| 2026-06-08 00:00 |
08:28:15.50 |
-08:01:26.3 |
HIP 41499 |
7.25 |
| 2026-06-08 12:00 |
08:28:18.10 |
-08:01:10.3 |
HIP 41499 |
7.94 |
| 2026-06-09 00:00 |
08:28:20.72 |
-08:00:54.4 |
HIP 41499 |
8.64 |
| 2026-06-09 12:00 |
08:28:23.37 |
-08:00:38.9 |
HIP 41499 |
9.34 |
| 2026-06-10 00:00 |
08:28:26.04 |
-08:00:23.6 |
HIP 41499 |
10.04 |
| 2026-06-10 12:00 |
08:28:28.73 |
-08:00:08.5 |
HIP 41499 |
10.75 |
| 2026-06-11 00:00 |
08:28:31.45 |
-07:59:53.7 |
HIP 41499 |
11.46 |
| 2026-06-11 12:00 |
08:28:34.18 |
-07:59:39.1 |
HIP 41499 |
12.17 |
| 2026-06-12 00:00 |
08:28:36.94 |
-07:59:24.7 |
HIP 41499 |
12.89 |
| 2026-06-12 12:00 |
08:28:39.72 |
-07:59:10.7 |
HIP 41499 |
13.61 |
| 2026-06-13 00:00 |
08:28:42.53 |
-07:58:56.8 |
HIP 41499 |
14.33 |
| 2026-06-13 12:00 |
08:28:45.35 |
-07:58:43.2 |
HIP 41499 |
15.06 |
| 2026-06-14 00:00 |
08:28:48.19 |
-07:58:29.9 |
HIP 41499 |
15.80 |
| 2026-06-14 12:00 |
08:28:51.06 |
-07:58:16.8 |
HIP 41499 |
16.53 |
| 2026-06-15 00:00 |
08:28:53.95 |
-07:58:04.0 |
HIP 41499 |
17.27 |
| 2026-06-15 12:00 |
08:28:56.85 |
-07:57:51.4 |
HIP 41499 |
18.01 |
| 2026-06-16 00:00 |
08:28:59.78 |
-07:57:39.1 |
HIP 41499 |
18.76 |
| 2026-06-16 12:00 |
08:29:02.73 |
-07:57:27.0 |
HIP 41499 |
19.51 |
| 2026-06-17 00:00 |
08:29:05.69 |
-07:57:15.2 |
HIP 41499 |
20.26 |
| 2026-06-17 12:00 |
08:29:08.68 |
-07:57:03.6 |
HIP 41499 |
21.02 |
| 2026-06-18 00:00 |
08:29:11.68 |
-07:56:52.3 |
HIP 41499 |
21.78 |
| 2026-06-18 12:00 |
08:29:14.70 |
-07:56:41.3 |
HIP 41499 |
22.54 |
| 2026-06-19 00:00 |
08:29:17.75 |
-07:56:30.5 |
HIP 41499 |
23.31 |
| 2026-06-19 12:00 |
08:29:20.81 |
-07:56:19.9 |
HIP 41499 |
24.07 |
| 2026-06-20 00:00 |
08:29:23.89 |
-07:56:09.6 |
HIP 41499 |
24.85 |
| 2026-06-20 12:00 |
08:29:26.98 |
-07:55:59.6 |
HIP 41595 |
25.10 |
| 2026-06-21 00:00 |
08:29:30.10 |
-07:55:49.8 |
HIP 41595 |
25.24 |
| 2026-06-21 12:00 |
08:29:33.23 |
-07:55:40.2 |
HIP 41595 |
25.42 |
| 2026-06-22 00:00 |
08:29:36.38 |
-07:55:30.9 |
HIP 41595 |
25.62 |