| Parameter |
Value |
| Designation |
P/2015 K5 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-06-06T08:58:18.402240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:11Z |
| Obs used |
56 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-06-12.0000000 |
| e |
0.55395709 |
| q (au) |
2.986133 |
| a (au) |
6.694721 |
| i (deg) |
39.987279 |
| Ω (om, deg) |
134.269042 |
| ω (w, deg) |
105.994786 |
| M (ma, deg) |
0.320124 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.097 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.097 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-07-29 00:00 |
06:00:25.86 |
-06:12:34.2 |
HIP 28487 |
24.88 |
| 2026-07-29 12:00 |
06:00:37.13 |
-06:13:05.1 |
HIP 28487 |
24.85 |
| 2026-07-30 00:00 |
06:00:48.35 |
-06:13:36.6 |
HIP 28487 |
25.15 |
| 2026-07-30 12:00 |
06:00:59.53 |
-06:14:08.6 |
HIP 28487 |
25.78 |
| 2026-07-31 00:00 |
06:01:10.67 |
-06:14:41.2 |
HIP 28487 |
26.70 |
| 2026-07-31 12:00 |
06:01:21.76 |
-06:15:14.4 |
HIP 28487 |
27.88 |
| 2026-08-01 00:00 |
06:01:32.80 |
-06:15:48.2 |
HIP 28487 |
29.29 |
| 2026-08-01 12:00 |
06:01:43.80 |
-06:16:22.5 |
HIP 28690 |
26.62 |
| 2026-08-02 00:00 |
06:01:54.75 |
-06:16:57.3 |
HIP 28690 |
23.84 |
| 2026-08-02 12:00 |
06:02:05.65 |
-06:17:32.8 |
HIP 28690 |
21.08 |
| 2026-08-03 00:00 |
06:02:16.50 |
-06:18:08.8 |
HIP 28690 |
18.32 |
| 2026-08-03 12:00 |
06:02:27.30 |
-06:18:45.4 |
HIP 28690 |
15.58 |
| 2026-08-04 00:00 |
06:02:38.06 |
-06:19:22.5 |
HIP 28690 |
12.85 |
| 2026-08-04 12:00 |
06:02:48.76 |
-06:20:00.1 |
HIP 28690 |
10.14 |
| 2026-08-05 00:00 |
06:02:59.42 |
-06:20:38.4 |
HIP 28690 |
7.45 |
| 2026-08-05 12:00 |
06:03:10.02 |
-06:21:17.2 |
HIP 28690 |
4.81 |
| 2026-08-06 00:00 |
06:03:20.57 |
-06:21:56.5 |
HIP 28690 |
2.33 |
| 2026-08-06 12:00 |
06:03:31.07 |
-06:22:36.4 |
HIP 28690 |
1.51 |
| 2026-08-07 00:00 |
06:03:41.52 |
-06:23:16.8 |
HIP 28690 |
3.68 |
| 2026-08-07 12:00 |
06:03:51.91 |
-06:23:57.8 |
HIP 28690 |
6.24 |
| 2026-08-08 00:00 |
06:04:02.25 |
-06:24:39.3 |
HIP 28690 |
8.86 |
| 2026-08-08 12:00 |
06:04:12.54 |
-06:25:21.3 |
HIP 28690 |
11.49 |
| 2026-08-09 00:00 |
06:04:22.77 |
-06:26:03.9 |
HIP 28690 |
14.11 |
| 2026-08-09 12:00 |
06:04:32.94 |
-06:26:47.0 |
HIP 28744 |
16.48 |
| 2026-08-10 00:00 |
06:04:43.06 |
-06:27:30.7 |
HIP 28744 |
16.72 |
| 2026-08-10 12:00 |
06:04:53.12 |
-06:28:14.9 |
HIP 28744 |
17.35 |
| 2026-08-11 00:00 |
06:05:03.12 |
-06:28:59.6 |
HIP 28889 |
16.21 |
| 2026-08-11 12:00 |
06:05:13.06 |
-06:29:44.8 |
HIP 28889 |
13.75 |
| 2026-08-12 00:00 |
06:05:22.95 |
-06:30:30.6 |
HIP 28889 |
11.35 |
| 2026-08-12 12:00 |
06:05:32.77 |
-06:31:16.8 |
HIP 28889 |
9.04 |
| 2026-08-13 00:00 |
06:05:42.54 |
-06:32:03.6 |
HIP 28889 |
6.91 |
| 2026-08-13 12:00 |
06:05:52.24 |
-06:32:50.9 |
HIP 28889 |
5.18 |
| 2026-08-14 00:00 |
06:06:01.89 |
-06:33:38.7 |
HIP 28889 |
4.31 |
| 2026-08-14 12:00 |
06:06:11.47 |
-06:34:27.0 |
HIP 28889 |
4.79 |
| 2026-08-15 00:00 |
06:06:20.99 |
-06:35:15.8 |
HIP 28889 |
6.30 |
| 2026-08-15 12:00 |
06:06:30.44 |
-06:36:05.1 |
HIP 28889 |
8.28 |
| 2026-08-16 00:00 |
06:06:39.84 |
-06:36:54.9 |
HIP 28889 |
10.47 |
| 2026-08-16 12:00 |
06:06:49.17 |
-06:37:45.2 |
HIP 28889 |
12.75 |
| 2026-08-17 00:00 |
06:06:58.43 |
-06:38:36.0 |
HIP 28889 |
15.07 |
| 2026-08-17 12:00 |
06:07:07.63 |
-06:39:27.3 |
HIP 28889 |
17.41 |
| 2026-08-18 00:00 |
06:07:16.76 |
-06:40:19.0 |
HIP 29115 |
18.16 |
| 2026-08-18 12:00 |
06:07:25.83 |
-06:41:11.2 |
HIP 29115 |
16.55 |
| 2026-08-19 00:00 |
06:07:34.83 |
-06:42:03.9 |
HIP 29115 |
15.17 |