| 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) |
| 2026-06-01 00:00 |
10:51:11.83 |
-16:55:12.2 |
HIP 53172 |
21.93 |
| 2026-06-01 12:00 |
10:51:11.49 |
-16:54:45.0 |
HIP 53172 |
22.15 |
| 2026-06-02 00:00 |
10:51:11.18 |
-16:54:17.9 |
HIP 53172 |
22.37 |
| 2026-06-02 12:00 |
10:51:10.91 |
-16:53:51.1 |
HIP 53172 |
22.58 |
| 2026-06-03 00:00 |
10:51:10.68 |
-16:53:24.4 |
HIP 53172 |
22.80 |
| 2026-06-03 12:00 |
10:51:10.47 |
-16:52:57.9 |
HIP 53172 |
23.01 |
| 2026-06-04 00:00 |
10:51:10.30 |
-16:52:31.7 |
HIP 53172 |
23.22 |
| 2026-06-04 12:00 |
10:51:10.16 |
-16:52:05.6 |
HIP 53172 |
23.43 |
| 2026-06-05 00:00 |
10:51:10.06 |
-16:51:39.7 |
HIP 53172 |
23.63 |
| 2026-06-05 12:00 |
10:51:09.98 |
-16:51:14.1 |
HIP 53172 |
23.83 |
| 2026-06-06 00:00 |
10:51:09.95 |
-16:50:48.6 |
HIP 53172 |
24.03 |
| 2026-06-06 12:00 |
10:51:09.94 |
-16:50:23.4 |
HIP 53172 |
24.23 |
| 2026-06-07 00:00 |
10:51:09.97 |
-16:49:58.3 |
HIP 53172 |
24.42 |
| 2026-06-07 12:00 |
10:51:10.03 |
-16:49:33.5 |
HIP 53172 |
24.61 |
| 2026-06-08 00:00 |
10:51:10.12 |
-16:49:08.9 |
HIP 53172 |
24.80 |
| 2026-06-08 12:00 |
10:51:10.25 |
-16:48:44.5 |
HIP 53172 |
24.99 |
| 2026-06-09 00:00 |
10:51:10.41 |
-16:48:20.3 |
HIP 53084 |
24.89 |
| 2026-06-09 12:00 |
10:51:10.60 |
-16:47:56.3 |
HIP 53084 |
24.49 |
| 2026-06-10 00:00 |
10:51:10.82 |
-16:47:32.6 |
HIP 53084 |
24.10 |
| 2026-06-10 12:00 |
10:51:11.08 |
-16:47:09.0 |
HIP 53084 |
23.70 |
| 2026-06-11 00:00 |
10:51:11.37 |
-16:46:45.7 |
HIP 53084 |
23.31 |
| 2026-06-11 12:00 |
10:51:11.69 |
-16:46:22.6 |
HIP 53084 |
22.92 |
| 2026-06-12 00:00 |
10:51:12.04 |
-16:45:59.8 |
HIP 53084 |
22.53 |
| 2026-06-12 12:00 |
10:51:12.43 |
-16:45:37.1 |
HIP 53084 |
22.14 |
| 2026-06-13 00:00 |
10:51:12.85 |
-16:45:14.7 |
HIP 53084 |
21.75 |
| 2026-06-13 12:00 |
10:51:13.30 |
-16:44:52.5 |
HIP 53084 |
21.37 |
| 2026-06-14 00:00 |
10:51:13.78 |
-16:44:30.6 |
HIP 53084 |
20.98 |
| 2026-06-14 12:00 |
10:51:14.30 |
-16:44:08.8 |
HIP 53084 |
20.60 |
| 2026-06-15 00:00 |
10:51:14.85 |
-16:43:47.3 |
HIP 53084 |
20.22 |
| 2026-06-15 12:00 |
10:51:15.43 |
-16:43:26.1 |
HIP 53084 |
19.84 |
| 2026-06-16 00:00 |
10:51:16.04 |
-16:43:05.0 |
HIP 53084 |
19.47 |
| 2026-06-16 12:00 |
10:51:16.68 |
-16:42:44.3 |
HIP 53084 |
19.09 |
| 2026-06-17 00:00 |
10:51:17.36 |
-16:42:23.7 |
HIP 53084 |
18.72 |
| 2026-06-17 12:00 |
10:51:18.06 |
-16:42:03.4 |
HIP 53084 |
18.35 |
| 2026-06-18 00:00 |
10:51:18.80 |
-16:41:43.3 |
HIP 53084 |
17.98 |
| 2026-06-18 12:00 |
10:51:19.57 |
-16:41:23.5 |
HIP 53084 |
17.62 |
| 2026-06-19 00:00 |
10:51:20.37 |
-16:41:03.9 |
HIP 53084 |
17.26 |
| 2026-06-19 12:00 |
10:51:21.20 |
-16:40:44.5 |
HIP 53084 |
16.90 |
| 2026-06-20 00:00 |
10:51:22.06 |
-16:40:25.4 |
HIP 53084 |
16.54 |
| 2026-06-20 12:00 |
10:51:22.95 |
-16:40:06.5 |
HIP 53084 |
16.19 |
| 2026-06-21 00:00 |
10:51:23.87 |
-16:39:47.9 |
HIP 53084 |
15.84 |
| 2026-06-21 12:00 |
10:51:24.83 |
-16:39:29.5 |
HIP 53084 |
15.50 |
| 2026-06-22 00:00 |
10:51:25.81 |
-16:39:11.4 |
HIP 53084 |
15.16 |