C/2012 V1 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2012 V1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-07-21T12:56:16.166400Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:04Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-12-06.0000000 |
| e |
0.99939324 |
| q (au) |
2.089202 |
| a (au) |
3443.236545 |
| i (deg) |
157.839966 |
| Ω (om, deg) |
85.369420 |
| ω (w, deg) |
123.335286 |
| M (ma, deg) |
359.998890 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.808 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.808 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.649 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
11:04:04.17 |
-18:47:27.5 |
HIP 54075 |
51.59 |
| 2026-02-03 12:00 |
11:04:00.25 |
-18:47:19.9 |
HIP 54075 |
51.68 |
| 2026-02-04 00:00 |
11:03:56.31 |
-18:47:12.0 |
HIP 54075 |
51.80 |
| 2026-02-04 12:00 |
11:03:52.35 |
-18:47:03.8 |
HIP 54075 |
51.94 |
| 2026-02-05 00:00 |
11:03:48.37 |
-18:46:55.3 |
HIP 53785 |
51.60 |
| 2026-02-05 12:00 |
11:03:44.37 |
-18:46:46.4 |
HIP 53785 |
50.72 |
| 2026-02-06 00:00 |
11:03:40.36 |
-18:46:37.3 |
HIP 53785 |
49.84 |
| 2026-02-06 12:00 |
11:03:36.32 |
-18:46:27.8 |
HIP 53785 |
48.96 |
| 2026-02-07 00:00 |
11:03:32.27 |
-18:46:18.1 |
HIP 53785 |
48.08 |
| 2026-02-07 12:00 |
11:03:28.20 |
-18:46:08.0 |
HIP 53785 |
47.20 |
| 2026-02-08 00:00 |
11:03:24.12 |
-18:45:57.6 |
HIP 53785 |
46.32 |
| 2026-02-08 12:00 |
11:03:20.01 |
-18:45:46.9 |
HIP 53785 |
45.44 |
| 2026-02-09 00:00 |
11:03:15.89 |
-18:45:35.9 |
HIP 53785 |
44.57 |
| 2026-02-09 12:00 |
11:03:11.76 |
-18:45:24.6 |
HIP 53785 |
43.70 |
| 2026-02-10 00:00 |
11:03:07.61 |
-18:45:13.0 |
HIP 53785 |
42.83 |
| 2026-02-10 12:00 |
11:03:03.44 |
-18:45:01.0 |
HIP 53785 |
41.96 |
| 2026-02-11 00:00 |
11:02:59.26 |
-18:44:48.8 |
HIP 53785 |
41.11 |
| 2026-02-11 12:00 |
11:02:55.06 |
-18:44:36.3 |
HIP 53785 |
40.25 |
| 2026-02-12 00:00 |
11:02:50.85 |
-18:44:23.4 |
HIP 53785 |
39.41 |
| 2026-02-12 12:00 |
11:02:46.62 |
-18:44:10.3 |
HIP 53785 |
38.57 |
| 2026-02-13 00:00 |
11:02:42.39 |
-18:43:56.9 |
HIP 53785 |
37.73 |
| 2026-02-13 12:00 |
11:02:38.13 |
-18:43:43.1 |
HIP 53785 |
36.91 |
| 2026-02-14 00:00 |
11:02:33.87 |
-18:43:29.1 |
HIP 53785 |
36.10 |
| 2026-02-14 12:00 |
11:02:29.59 |
-18:43:14.7 |
HIP 53785 |
35.30 |
| 2026-02-15 00:00 |
11:02:25.30 |
-18:43:00.1 |
HIP 53785 |
34.51 |
| 2026-02-15 12:00 |
11:02:20.99 |
-18:42:45.1 |
HIP 53785 |
33.73 |
| 2026-02-16 00:00 |
11:02:16.68 |
-18:42:29.9 |
HIP 53785 |
32.97 |
| 2026-02-16 12:00 |
11:02:12.35 |
-18:42:14.3 |
HIP 53785 |
32.23 |
| 2026-02-17 00:00 |
11:02:08.01 |
-18:41:58.5 |
HIP 53785 |
31.51 |
| 2026-02-17 12:00 |
11:02:03.67 |
-18:41:42.4 |
HIP 53809 |
30.77 |
| 2026-02-18 00:00 |
11:01:59.31 |
-18:41:26.0 |
HIP 53809 |
29.86 |
| 2026-02-18 12:00 |
11:01:54.94 |
-18:41:09.3 |
HIP 53809 |
28.96 |
| 2026-02-19 00:00 |
11:01:50.56 |
-18:40:52.3 |
HIP 53809 |
28.06 |
| 2026-02-19 12:00 |
11:01:46.17 |
-18:40:35.0 |
HIP 53809 |
27.18 |
| 2026-02-20 00:00 |
11:01:41.78 |
-18:40:17.4 |
HIP 53809 |
26.30 |
| 2026-02-20 12:00 |
11:01:37.37 |
-18:39:59.5 |
HIP 53809 |
25.43 |
| 2026-02-21 00:00 |
11:01:32.96 |
-18:39:41.4 |
HIP 53809 |
24.58 |
| 2026-02-21 12:00 |
11:01:28.54 |
-18:39:23.0 |
HIP 53809 |
23.74 |
| 2026-02-22 00:00 |
11:01:24.11 |
-18:39:04.3 |
HIP 53809 |
22.92 |
| 2026-02-22 12:00 |
11:01:19.68 |
-18:38:45.3 |
HIP 53809 |
22.11 |
| 2026-02-23 00:00 |
11:01:15.24 |
-18:38:26.0 |
HIP 53809 |
21.33 |
| 2026-02-23 12:00 |
11:01:10.79 |
-18:38:06.5 |
HIP 53809 |
20.57 |
| 2026-02-24 00:00 |
11:01:06.34 |
-18:37:46.7 |
HIP 53809 |
19.84 |