| 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) |
| 2026-07-29 00:00 |
10:53:52.19 |
-16:28:43.2 |
HIP 53178 |
18.38 |
| 2026-07-29 12:00 |
10:53:55.00 |
-16:28:44.6 |
HIP 53178 |
19.01 |
| 2026-07-30 00:00 |
10:53:57.83 |
-16:28:46.2 |
HIP 53178 |
19.63 |
| 2026-07-30 12:00 |
10:54:00.68 |
-16:28:48.0 |
HIP 53178 |
20.27 |
| 2026-07-31 00:00 |
10:54:03.54 |
-16:28:50.2 |
HIP 53178 |
20.91 |
| 2026-07-31 12:00 |
10:54:06.42 |
-16:28:52.5 |
HIP 53178 |
21.55 |
| 2026-08-01 00:00 |
10:54:09.31 |
-16:28:55.2 |
HIP 53178 |
22.20 |
| 2026-08-01 12:00 |
10:54:12.22 |
-16:28:58.0 |
HIP 53178 |
22.86 |
| 2026-08-02 00:00 |
10:54:15.15 |
-16:29:01.2 |
HIP 53429 |
22.86 |
| 2026-08-02 12:00 |
10:54:18.09 |
-16:29:04.6 |
HIP 53429 |
22.21 |
| 2026-08-03 00:00 |
10:54:21.05 |
-16:29:08.2 |
HIP 53429 |
21.55 |
| 2026-08-03 12:00 |
10:54:24.02 |
-16:29:12.1 |
HIP 53429 |
20.90 |
| 2026-08-04 00:00 |
10:54:27.01 |
-16:29:16.3 |
HIP 53429 |
20.25 |
| 2026-08-04 12:00 |
10:54:30.01 |
-16:29:20.7 |
HIP 53429 |
19.61 |
| 2026-08-05 00:00 |
10:54:33.03 |
-16:29:25.4 |
HIP 53429 |
18.97 |
| 2026-08-05 12:00 |
10:54:36.07 |
-16:29:30.3 |
HIP 53429 |
18.33 |
| 2026-08-06 00:00 |
10:54:39.12 |
-16:29:35.5 |
HIP 53429 |
17.70 |
| 2026-08-06 12:00 |
10:54:42.18 |
-16:29:40.9 |
HIP 53429 |
17.08 |
| 2026-08-07 00:00 |
10:54:45.25 |
-16:29:46.6 |
HIP 53429 |
16.47 |
| 2026-08-07 12:00 |
10:54:48.34 |
-16:29:52.5 |
HIP 53429 |
15.86 |
| 2026-08-08 00:00 |
10:54:51.45 |
-16:29:58.7 |
HIP 53429 |
15.27 |
| 2026-08-08 12:00 |
10:54:54.56 |
-16:30:05.1 |
HIP 53429 |
14.70 |
| 2026-08-09 00:00 |
10:54:57.70 |
-16:30:11.8 |
HIP 53429 |
14.14 |
| 2026-08-09 12:00 |
10:55:00.84 |
-16:30:18.7 |
HIP 53429 |
13.59 |
| 2026-08-10 00:00 |
10:55:03.99 |
-16:30:25.9 |
HIP 53429 |
13.08 |
| 2026-08-10 12:00 |
10:55:07.16 |
-16:30:33.3 |
HIP 53429 |
12.58 |
| 2026-08-11 00:00 |
10:55:10.34 |
-16:30:41.0 |
HIP 53429 |
12.12 |
| 2026-08-11 12:00 |
10:55:13.54 |
-16:30:48.9 |
HIP 53429 |
11.69 |
| 2026-08-12 00:00 |
10:55:16.74 |
-16:30:57.0 |
HIP 53429 |
11.30 |
| 2026-08-12 12:00 |
10:55:19.96 |
-16:31:05.5 |
HIP 53429 |
10.95 |
| 2026-08-13 00:00 |
10:55:23.18 |
-16:31:14.1 |
HIP 53429 |
10.66 |
| 2026-08-13 12:00 |
10:55:26.42 |
-16:31:23.0 |
HIP 53429 |
10.41 |
| 2026-08-14 00:00 |
10:55:29.67 |
-16:31:32.1 |
HIP 53429 |
10.23 |
| 2026-08-14 12:00 |
10:55:32.93 |
-16:31:41.5 |
HIP 53429 |
10.10 |
| 2026-08-15 00:00 |
10:55:36.20 |
-16:31:51.1 |
HIP 53429 |
10.04 |
| 2026-08-15 12:00 |
10:55:39.48 |
-16:32:01.0 |
HIP 53429 |
10.05 |
| 2026-08-16 00:00 |
10:55:42.77 |
-16:32:11.1 |
HIP 53429 |
10.13 |
| 2026-08-16 12:00 |
10:55:46.07 |
-16:32:21.4 |
HIP 53429 |
10.27 |
| 2026-08-17 00:00 |
10:55:49.38 |
-16:32:32.0 |
HIP 53429 |
10.48 |
| 2026-08-17 12:00 |
10:55:52.69 |
-16:32:42.8 |
HIP 53429 |
10.75 |
| 2026-08-18 00:00 |
10:55:56.02 |
-16:32:53.8 |
HIP 53429 |
11.07 |
| 2026-08-18 12:00 |
10:55:59.35 |
-16:33:05.1 |
HIP 53429 |
11.45 |
| 2026-08-19 00:00 |
10:56:02.70 |
-16:33:16.6 |
HIP 53429 |
11.88 |