| 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) |
| 2026-05-12 00:00 |
07:40:14.75 |
-27:45:12.4 |
HIP 37399 |
13.14 |
| 2026-05-12 12:00 |
07:40:16.55 |
-27:44:33.7 |
HIP 37399 |
13.53 |
| 2026-05-13 00:00 |
07:40:18.39 |
-27:43:55.4 |
HIP 37399 |
13.94 |
| 2026-05-13 12:00 |
07:40:20.25 |
-27:43:17.3 |
HIP 37399 |
14.38 |
| 2026-05-14 00:00 |
07:40:22.16 |
-27:42:39.4 |
HIP 37399 |
14.83 |
| 2026-05-14 12:00 |
07:40:24.10 |
-27:42:01.9 |
HIP 37399 |
15.30 |
| 2026-05-15 00:00 |
07:40:26.07 |
-27:41:24.6 |
HIP 37399 |
15.78 |
| 2026-05-15 12:00 |
07:40:28.07 |
-27:40:47.6 |
HIP 37399 |
16.28 |
| 2026-05-16 00:00 |
07:40:30.11 |
-27:40:10.9 |
HIP 37399 |
16.80 |
| 2026-05-16 12:00 |
07:40:32.18 |
-27:39:34.5 |
HIP 37399 |
17.33 |
| 2026-05-17 00:00 |
07:40:34.28 |
-27:38:58.4 |
HIP 37399 |
17.86 |
| 2026-05-17 12:00 |
07:40:36.42 |
-27:38:22.5 |
HIP 37399 |
18.41 |
| 2026-05-18 00:00 |
07:40:38.59 |
-27:37:47.0 |
HIP 37399 |
18.97 |
| 2026-05-18 12:00 |
07:40:40.79 |
-27:37:11.7 |
HIP 37399 |
19.54 |
| 2026-05-19 00:00 |
07:40:43.02 |
-27:36:36.8 |
HIP 37399 |
20.11 |
| 2026-05-19 12:00 |
07:40:45.29 |
-27:36:02.1 |
HIP 37399 |
20.69 |
| 2026-05-20 00:00 |
07:40:47.59 |
-27:35:27.7 |
HIP 37399 |
21.28 |
| 2026-05-20 12:00 |
07:40:49.91 |
-27:34:53.7 |
HIP 37399 |
21.87 |
| 2026-05-21 00:00 |
07:40:52.27 |
-27:34:20.0 |
HIP 37399 |
22.48 |
| 2026-05-21 12:00 |
07:40:54.66 |
-27:33:46.5 |
HIP 37482 |
22.18 |
| 2026-05-22 00:00 |
07:40:57.08 |
-27:33:13.4 |
HIP 37482 |
21.45 |
| 2026-05-22 12:00 |
07:40:59.53 |
-27:32:40.6 |
HIP 37482 |
20.72 |
| 2026-05-23 00:00 |
07:41:02.01 |
-27:32:08.1 |
HIP 37482 |
19.99 |
| 2026-05-23 12:00 |
07:41:04.52 |
-27:31:35.9 |
HIP 37482 |
19.28 |
| 2026-05-24 00:00 |
07:41:07.06 |
-27:31:04.1 |
HIP 37482 |
18.56 |
| 2026-05-24 12:00 |
07:41:09.63 |
-27:30:32.5 |
HIP 37482 |
17.86 |
| 2026-05-25 00:00 |
07:41:12.23 |
-27:30:01.3 |
HIP 37482 |
17.16 |
| 2026-05-25 12:00 |
07:41:14.85 |
-27:29:30.4 |
HIP 37482 |
16.48 |
| 2026-05-26 00:00 |
07:41:17.51 |
-27:28:59.8 |
HIP 37482 |
15.81 |
| 2026-05-26 12:00 |
07:41:20.19 |
-27:28:29.5 |
HIP 37482 |
15.15 |
| 2026-05-27 00:00 |
07:41:22.90 |
-27:27:59.6 |
HIP 37482 |
14.50 |
| 2026-05-27 12:00 |
07:41:25.64 |
-27:27:30.0 |
HIP 37482 |
13.87 |
| 2026-05-28 00:00 |
07:41:28.40 |
-27:27:00.7 |
HIP 37482 |
13.27 |
| 2026-05-28 12:00 |
07:41:31.20 |
-27:26:31.8 |
HIP 37482 |
12.69 |
| 2026-05-29 00:00 |
07:41:34.02 |
-27:26:03.2 |
HIP 37482 |
12.13 |
| 2026-05-29 12:00 |
07:41:36.86 |
-27:25:34.9 |
HIP 37482 |
11.61 |
| 2026-05-30 00:00 |
07:41:39.74 |
-27:25:07.0 |
HIP 37482 |
11.13 |
| 2026-05-30 12:00 |
07:41:42.63 |
-27:24:39.4 |
HIP 37482 |
10.69 |
| 2026-05-31 00:00 |
07:41:45.56 |
-27:24:12.1 |
HIP 37482 |
10.29 |
| 2026-05-31 12:00 |
07:41:48.51 |
-27:23:45.2 |
HIP 37482 |
9.95 |
| 2026-06-01 00:00 |
07:41:51.49 |
-27:23:18.6 |
HIP 37482 |
9.68 |
| 2026-06-01 12:00 |
07:41:54.49 |
-27:22:52.4 |
HIP 37482 |
9.46 |
| 2026-06-02 00:00 |
07:41:57.52 |
-27:22:26.5 |
HIP 37482 |
9.32 |