| Parameter |
Value |
| Designation |
C/2013 P2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-02-17T01:18:12.876480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:38Z |
| Obs used |
295 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-02-23.0000000 |
| e |
0.99890182 |
| q (au) |
2.834925 |
| a (au) |
2581.478285 |
| i (deg) |
125.532159 |
| Ω (om, deg) |
2.028690 |
| ω (w, deg) |
104.973695 |
| M (ma, deg) |
0.000045 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.539 + 2.416\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.539 |
| n |
2.416 |
| gf |
0.907 |
| gb |
-0.906 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
07:40:20.70 |
-28:58:38.6 |
HIP 37314 |
9.63 |
| 2026-03-26 12:00 |
07:40:18.68 |
-28:57:48.6 |
HIP 37314 |
9.45 |
| 2026-03-27 00:00 |
07:40:16.70 |
-28:56:58.6 |
HIP 37314 |
9.36 |
| 2026-03-27 12:00 |
07:40:14.77 |
-28:56:08.6 |
HIP 37314 |
9.38 |
| 2026-03-28 00:00 |
07:40:12.88 |
-28:55:18.5 |
HIP 37314 |
9.49 |
| 2026-03-28 12:00 |
07:40:11.03 |
-28:54:28.4 |
HIP 37314 |
9.70 |
| 2026-03-29 00:00 |
07:40:09.23 |
-28:53:38.2 |
HIP 37314 |
10.01 |
| 2026-03-29 12:00 |
07:40:07.47 |
-28:52:48.0 |
HIP 37314 |
10.39 |
| 2026-03-30 00:00 |
07:40:05.75 |
-28:51:57.8 |
HIP 37314 |
10.84 |
| 2026-03-30 12:00 |
07:40:04.07 |
-28:51:07.6 |
HIP 37314 |
11.35 |
| 2026-03-31 00:00 |
07:40:02.44 |
-28:50:17.4 |
HIP 37314 |
11.92 |
| 2026-03-31 12:00 |
07:40:00.85 |
-28:49:27.1 |
HIP 37314 |
12.53 |
| 2026-04-01 00:00 |
07:39:59.30 |
-28:48:36.8 |
HIP 37314 |
13.17 |
| 2026-04-01 12:00 |
07:39:57.80 |
-28:47:46.5 |
HIP 37314 |
13.85 |
| 2026-04-02 00:00 |
07:39:56.34 |
-28:46:56.3 |
HIP 37314 |
14.56 |
| 2026-04-02 12:00 |
07:39:54.92 |
-28:46:06.0 |
HIP 37314 |
15.29 |
| 2026-04-03 00:00 |
07:39:53.55 |
-28:45:15.7 |
HIP 37314 |
16.04 |
| 2026-04-03 12:00 |
07:39:52.21 |
-28:44:25.4 |
HIP 37314 |
16.80 |
| 2026-04-04 00:00 |
07:39:50.92 |
-28:43:35.2 |
HIP 37314 |
17.57 |
| 2026-04-04 12:00 |
07:39:49.68 |
-28:42:45.0 |
HIP 37314 |
18.36 |
| 2026-04-05 00:00 |
07:39:48.48 |
-28:41:54.7 |
HIP 37314 |
19.16 |
| 2026-04-05 12:00 |
07:39:47.32 |
-28:41:04.5 |
HIP 37207 |
19.33 |
| 2026-04-06 00:00 |
07:39:46.20 |
-28:40:14.4 |
HIP 37207 |
18.65 |
| 2026-04-06 12:00 |
07:39:45.12 |
-28:39:24.3 |
HIP 37207 |
18.01 |
| 2026-04-07 00:00 |
07:39:44.09 |
-28:38:34.2 |
HIP 37207 |
17.39 |
| 2026-04-07 12:00 |
07:39:43.10 |
-28:37:44.1 |
HIP 37207 |
16.80 |
| 2026-04-08 00:00 |
07:39:42.16 |
-28:36:54.1 |
HIP 37207 |
16.24 |
| 2026-04-08 12:00 |
07:39:41.26 |
-28:36:04.1 |
HIP 37207 |
15.73 |
| 2026-04-09 00:00 |
07:39:40.40 |
-28:35:14.2 |
HIP 37207 |
15.25 |
| 2026-04-09 12:00 |
07:39:39.58 |
-28:34:24.3 |
HIP 37207 |
14.81 |
| 2026-04-10 00:00 |
07:39:38.81 |
-28:33:34.5 |
HIP 37207 |
14.42 |
| 2026-04-10 12:00 |
07:39:38.08 |
-28:32:44.8 |
HIP 37207 |
14.08 |
| 2026-04-11 00:00 |
07:39:37.39 |
-28:31:55.1 |
HIP 37207 |
13.79 |
| 2026-04-11 12:00 |
07:39:36.75 |
-28:31:05.5 |
HIP 37207 |
13.56 |
| 2026-04-12 00:00 |
07:39:36.14 |
-28:30:15.9 |
HIP 37207 |
13.38 |
| 2026-04-12 12:00 |
07:39:35.59 |
-28:29:26.5 |
HIP 37207 |
13.27 |
| 2026-04-13 00:00 |
07:39:35.07 |
-28:28:37.1 |
HIP 37207 |
13.22 |
| 2026-04-13 12:00 |
07:39:34.60 |
-28:27:47.8 |
HIP 37207 |
13.22 |
| 2026-04-14 00:00 |
07:39:34.16 |
-28:26:58.6 |
HIP 37207 |
13.29 |
| 2026-04-14 12:00 |
07:39:33.78 |
-28:26:09.5 |
HIP 37207 |
13.42 |
| 2026-04-15 00:00 |
07:39:33.43 |
-28:25:20.4 |
HIP 37207 |
13.60 |
| 2026-04-15 12:00 |
07:39:33.13 |
-28:24:31.5 |
HIP 37207 |
13.84 |
| 2026-04-16 00:00 |
07:39:32.87 |
-28:23:42.7 |
HIP 37207 |
14.13 |