| Parameter |
Value |
| Designation |
P/2016 P1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-09-08T07:16:06.602880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:26Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-08-06.0000000 |
| e |
0.29419825 |
| q (au) |
2.279185 |
| a (au) |
3.229214 |
| i (deg) |
25.706555 |
| Ω (om, deg) |
319.536773 |
| ω (w, deg) |
267.536803 |
| M (ma, deg) |
56.507743 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.843 |
| k |
0.985 |
| δ90 |
9.996 |
| 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 |
07:58:45.99 |
+22:14:47.6 |
HIP 39223 |
36.79 |
| 2026-05-12 12:00 |
07:59:15.63 |
+22:10:56.1 |
HIP 39223 |
31.17 |
| 2026-05-13 00:00 |
07:59:45.43 |
+22:07:04.3 |
HIP 39223 |
26.68 |
| 2026-05-13 12:00 |
08:00:15.40 |
+22:03:12.0 |
HIP 39223 |
23.99 |
| 2026-05-14 00:00 |
08:00:45.53 |
+21:59:19.4 |
HIP 39223 |
23.76 |
| 2026-05-14 12:00 |
08:01:15.82 |
+21:55:26.3 |
HIP 39344 |
18.28 |
| 2026-05-15 00:00 |
08:01:46.28 |
+21:51:32.9 |
HIP 39344 |
10.98 |
| 2026-05-15 12:00 |
08:02:16.89 |
+21:47:39.1 |
HIP 39344 |
6.05 |
| 2026-05-16 00:00 |
08:02:47.66 |
+21:43:44.9 |
HIP 39344 |
9.18 |
| 2026-05-16 12:00 |
08:03:18.58 |
+21:39:50.2 |
HIP 39410 |
11.26 |
| 2026-05-17 00:00 |
08:03:49.65 |
+21:35:55.2 |
HIP 39410 |
16.21 |
| 2026-05-17 12:00 |
08:04:20.88 |
+21:31:59.7 |
HIP 39422 |
18.16 |
| 2026-05-18 00:00 |
08:04:52.26 |
+21:28:03.8 |
HIP 39422 |
21.51 |
| 2026-05-18 12:00 |
08:05:23.79 |
+21:24:07.5 |
HIP 39503 |
26.97 |
| 2026-05-19 00:00 |
08:05:55.46 |
+21:20:10.7 |
HIP 39503 |
28.33 |
| 2026-05-19 12:00 |
08:06:27.28 |
+21:16:13.5 |
HIP 39711 |
24.08 |
| 2026-05-20 00:00 |
08:06:59.25 |
+21:12:15.8 |
HIP 39826 |
18.26 |
| 2026-05-20 12:00 |
08:07:31.35 |
+21:08:17.7 |
HIP 39826 |
9.99 |
| 2026-05-21 00:00 |
08:08:03.60 |
+21:04:19.2 |
HIP 39826 |
3.06 |
| 2026-05-21 12:00 |
08:08:35.98 |
+21:00:20.2 |
HIP 39826 |
8.00 |
| 2026-05-22 00:00 |
08:09:08.51 |
+20:56:20.7 |
HIP 39826 |
16.30 |
| 2026-05-22 12:00 |
08:09:41.16 |
+20:52:20.7 |
HIP 40054 |
17.86 |
| 2026-05-23 00:00 |
08:10:13.95 |
+20:48:20.3 |
HIP 40054 |
9.44 |
| 2026-05-23 12:00 |
08:10:46.88 |
+20:44:19.4 |
HIP 40054 |
2.91 |
| 2026-05-24 00:00 |
08:11:19.93 |
+20:40:18.0 |
HIP 40054 |
8.89 |
| 2026-05-24 12:00 |
08:11:53.12 |
+20:36:16.1 |
HIP 40054 |
17.39 |
| 2026-05-25 00:00 |
08:12:26.43 |
+20:32:13.8 |
HIP 40270 |
20.30 |
| 2026-05-25 12:00 |
08:12:59.87 |
+20:28:10.9 |
HIP 40270 |
12.56 |
| 2026-05-26 00:00 |
08:13:33.43 |
+20:24:07.6 |
HIP 40270 |
7.69 |
| 2026-05-26 12:00 |
08:14:07.12 |
+20:20:03.7 |
HIP 40270 |
10.85 |
| 2026-05-27 00:00 |
08:14:40.93 |
+20:15:59.3 |
HIP 40399 |
2.80 |
| 2026-05-27 12:00 |
08:15:14.87 |
+20:11:54.5 |
HIP 40399 |
7.49 |
| 2026-05-28 00:00 |
08:15:48.92 |
+20:07:49.1 |
HIP 40399 |
16.29 |
| 2026-05-28 12:00 |
08:16:23.09 |
+20:03:43.1 |
HIP 40644 |
24.52 |
| 2026-05-29 00:00 |
08:16:57.38 |
+19:59:36.7 |
HIP 40644 |
15.58 |
| 2026-05-29 12:00 |
08:17:31.79 |
+19:55:29.7 |
HIP 40644 |
6.86 |
| 2026-05-30 00:00 |
08:18:06.31 |
+19:51:22.2 |
HIP 40644 |
4.04 |
| 2026-05-30 12:00 |
08:18:40.95 |
+19:47:14.1 |
HIP 40644 |
12.34 |
| 2026-05-31 00:00 |
08:19:15.69 |
+19:43:05.5 |
HIP 40832 |
13.14 |
| 2026-05-31 12:00 |
08:19:50.56 |
+19:38:56.3 |
HIP 40836 |
12.02 |
| 2026-06-01 00:00 |
08:20:25.53 |
+19:34:46.6 |
HIP 40836 |
9.47 |
| 2026-06-01 12:00 |
08:21:00.61 |
+19:30:36.3 |
HIP 40836 |
14.36 |
| 2026-06-02 00:00 |
08:21:35.80 |
+19:26:25.5 |
HIP 40836 |
22.26 |