| Parameter |
Value |
| Designation |
P/2013 P1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-02-26T02:07:13.362240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:38Z |
| Obs used |
82 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-08-21.0000000 |
| e |
0.60522864 |
| q (au) |
3.390237 |
| a (au) |
8.587850 |
| i (deg) |
18.702011 |
| Ω (om, deg) |
160.795185 |
| ω (w, deg) |
138.108831 |
| M (ma, deg) |
6.889250 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.658 + 2.955\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.658 |
| n |
2.955 |
| gf |
1.000 |
| gb |
-0.929 |
| k |
1.000 |
| 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 |
07:59:48.07 |
+09:17:15.0 |
HIP 39134 |
20.27 |
| 2026-06-01 12:00 |
07:59:54.88 |
+09:17:17.8 |
HIP 39134 |
19.75 |
| 2026-06-02 00:00 |
08:00:01.74 |
+09:17:20.3 |
HIP 39134 |
19.35 |
| 2026-06-02 12:00 |
08:00:08.64 |
+09:17:22.5 |
HIP 39134 |
19.09 |
| 2026-06-03 00:00 |
08:00:15.58 |
+09:17:24.4 |
HIP 39134 |
18.97 |
| 2026-06-03 12:00 |
08:00:22.56 |
+09:17:26.0 |
HIP 39134 |
19.00 |
| 2026-06-04 00:00 |
08:00:29.59 |
+09:17:27.3 |
HIP 39134 |
19.18 |
| 2026-06-04 12:00 |
08:00:36.66 |
+09:17:28.3 |
HIP 39134 |
19.52 |
| 2026-06-05 00:00 |
08:00:43.77 |
+09:17:29.1 |
HIP 39134 |
20.00 |
| 2026-06-05 12:00 |
08:00:50.92 |
+09:17:29.5 |
HIP 39134 |
20.62 |
| 2026-06-06 00:00 |
08:00:58.12 |
+09:17:29.7 |
HIP 39134 |
21.36 |
| 2026-06-06 12:00 |
08:01:05.35 |
+09:17:29.5 |
HIP 39258 |
22.01 |
| 2026-06-07 00:00 |
08:01:12.63 |
+09:17:29.1 |
HIP 39258 |
21.36 |
| 2026-06-07 12:00 |
08:01:19.95 |
+09:17:28.4 |
HIP 39258 |
20.84 |
| 2026-06-08 00:00 |
08:01:27.30 |
+09:17:27.3 |
HIP 39258 |
20.47 |
| 2026-06-08 12:00 |
08:01:34.70 |
+09:17:26.0 |
HIP 39258 |
20.26 |
| 2026-06-09 00:00 |
08:01:42.13 |
+09:17:24.4 |
HIP 39258 |
20.22 |
| 2026-06-09 12:00 |
08:01:49.61 |
+09:17:22.5 |
HIP 39258 |
20.35 |
| 2026-06-10 00:00 |
08:01:57.12 |
+09:17:20.3 |
HIP 39258 |
20.65 |
| 2026-06-10 12:00 |
08:02:04.67 |
+09:17:17.9 |
HIP 39258 |
21.12 |
| 2026-06-11 00:00 |
08:02:12.25 |
+09:17:15.1 |
HIP 39258 |
21.75 |
| 2026-06-11 12:00 |
08:02:19.88 |
+09:17:12.0 |
HIP 39258 |
22.52 |
| 2026-06-12 00:00 |
08:02:27.54 |
+09:17:08.7 |
HIP 39258 |
23.43 |
| 2026-06-12 12:00 |
08:02:35.23 |
+09:17:05.1 |
HIP 39258 |
24.45 |
| 2026-06-13 00:00 |
08:02:42.97 |
+09:17:01.1 |
HIP 39258 |
25.59 |
| 2026-06-13 12:00 |
08:02:50.73 |
+09:16:56.9 |
HIP 39506 |
24.43 |
| 2026-06-14 00:00 |
08:02:58.54 |
+09:16:52.4 |
HIP 39506 |
22.50 |
| 2026-06-14 12:00 |
08:03:06.37 |
+09:16:47.6 |
HIP 39506 |
20.57 |
| 2026-06-15 00:00 |
08:03:14.25 |
+09:16:42.5 |
HIP 39506 |
18.62 |
| 2026-06-15 12:00 |
08:03:22.15 |
+09:16:37.1 |
HIP 39506 |
16.67 |
| 2026-06-16 00:00 |
08:03:30.09 |
+09:16:31.5 |
HIP 39506 |
14.71 |
| 2026-06-16 12:00 |
08:03:38.06 |
+09:16:25.5 |
HIP 39506 |
12.74 |
| 2026-06-17 00:00 |
08:03:46.06 |
+09:16:19.3 |
HIP 39506 |
10.77 |
| 2026-06-17 12:00 |
08:03:54.10 |
+09:16:12.8 |
HIP 39506 |
8.78 |
| 2026-06-18 00:00 |
08:04:02.17 |
+09:16:05.9 |
HIP 39506 |
6.79 |
| 2026-06-18 12:00 |
08:04:10.26 |
+09:15:58.9 |
HIP 39506 |
4.79 |
| 2026-06-19 00:00 |
08:04:18.39 |
+09:15:51.5 |
HIP 39506 |
2.80 |
| 2026-06-19 12:00 |
08:04:26.55 |
+09:15:43.8 |
HIP 39506 |
0.85 |
| 2026-06-20 00:00 |
08:04:34.73 |
+09:15:35.9 |
HIP 39506 |
1.33 |
| 2026-06-20 12:00 |
08:04:42.95 |
+09:15:27.7 |
HIP 39506 |
3.33 |
| 2026-06-21 00:00 |
08:04:51.19 |
+09:15:19.2 |
HIP 39506 |
5.36 |
| 2026-06-21 12:00 |
08:04:59.47 |
+09:15:10.4 |
HIP 39506 |
7.40 |
| 2026-06-22 00:00 |
08:05:07.77 |
+09:15:01.4 |
HIP 39506 |
9.45 |