P/2016 P5 (COIAS)
| Parameter |
Value |
| Designation |
P/2016 P5 (COIAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-06-01T11:27:59.958720Z |
| Orbit solution date (soln_date, UTC) |
2025-11-29T13:16:06Z |
| Obs used |
233 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
16.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2016-08-01T11:41:07.296000Z |
| Discovery magnitude (MPC) |
24.10 z |
| Discovery observatory (MPC) |
T09 · Subaru Telescope, Maunakea |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-01-25.0000000 |
| e |
0.05782618 |
| q (au) |
4.432529 |
| a (au) |
4.704577 |
| i (deg) |
7.037213 |
| Ω (om, deg) |
185.406426 |
| ω (w, deg) |
34.976810 |
| M (ma, deg) |
312.432548 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.470 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.470 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.581 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
21:25:00.10 |
-10:54:53.0 |
HIP 105859 |
21.21 |
| 2026-02-03 12:00 |
21:25:29.69 |
-10:52:45.8 |
HIP 105859 |
14.13 |
| 2026-02-04 00:00 |
21:25:59.28 |
-10:50:38.2 |
HIP 105859 |
8.01 |
| 2026-02-04 12:00 |
21:26:28.86 |
-10:48:30.2 |
HIP 105859 |
6.57 |
| 2026-02-05 00:00 |
21:26:58.43 |
-10:46:21.8 |
HIP 105859 |
11.70 |
| 2026-02-05 12:00 |
21:27:28.00 |
-10:44:13.0 |
HIP 105859 |
18.59 |
| 2026-02-06 00:00 |
21:27:57.56 |
-10:42:03.8 |
HIP 105859 |
25.86 |
| 2026-02-06 12:00 |
21:28:27.12 |
-10:39:54.3 |
HIP 106087 |
24.60 |
| 2026-02-07 00:00 |
21:28:56.67 |
-10:37:44.4 |
HIP 106087 |
19.39 |
| 2026-02-07 12:00 |
21:29:26.21 |
-10:35:34.1 |
HIP 106087 |
16.18 |
| 2026-02-08 00:00 |
21:29:55.74 |
-10:33:23.5 |
HIP 106087 |
16.18 |
| 2026-02-08 12:00 |
21:30:25.26 |
-10:31:12.5 |
HIP 106087 |
19.41 |
| 2026-02-09 00:00 |
21:30:54.77 |
-10:29:01.1 |
HIP 106087 |
24.63 |
| 2026-02-09 12:00 |
21:31:24.27 |
-10:26:49.3 |
HIP 106365 |
18.50 |
| 2026-02-10 00:00 |
21:31:53.76 |
-10:24:37.3 |
HIP 106365 |
13.12 |
| 2026-02-10 12:00 |
21:32:23.24 |
-10:22:24.8 |
HIP 106365 |
10.81 |
| 2026-02-11 00:00 |
21:32:52.71 |
-10:20:12.1 |
HIP 106365 |
13.29 |
| 2026-02-11 12:00 |
21:33:22.16 |
-10:17:59.0 |
HIP 106365 |
18.74 |
| 2026-02-12 00:00 |
21:33:51.60 |
-10:15:45.5 |
HIP 106365 |
25.31 |
| 2026-02-12 12:00 |
21:34:21.03 |
-10:13:31.7 |
HIP 106617 |
24.43 |
| 2026-02-13 00:00 |
21:34:50.44 |
-10:11:17.6 |
HIP 106617 |
17.45 |
| 2026-02-13 12:00 |
21:35:19.83 |
-10:09:03.2 |
HIP 106617 |
11.27 |
| 2026-02-14 00:00 |
21:35:49.21 |
-10:06:48.5 |
HIP 106617 |
8.01 |
| 2026-02-14 12:00 |
21:36:18.57 |
-10:04:33.4 |
HIP 106709 |
10.75 |
| 2026-02-15 00:00 |
21:36:47.91 |
-10:02:18.1 |
HIP 106709 |
8.36 |
| 2026-02-15 12:00 |
21:37:17.24 |
-10:00:02.4 |
HIP 106709 |
11.77 |
| 2026-02-16 00:00 |
21:37:46.55 |
-09:57:46.4 |
HIP 106709 |
17.94 |
| 2026-02-16 12:00 |
21:38:15.83 |
-09:55:30.2 |
HIP 106795 |
20.68 |
| 2026-02-17 00:00 |
21:38:45.10 |
-09:53:13.6 |
HIP 106795 |
22.04 |
| 2026-02-17 12:00 |
21:39:14.34 |
-09:50:56.8 |
HIP 107001 |
14.53 |
| 2026-02-18 00:00 |
21:39:43.57 |
-09:48:39.7 |
HIP 107001 |
7.03 |
| 2026-02-18 12:00 |
21:40:12.77 |
-09:46:22.4 |
HIP 107001 |
1.31 |
| 2026-02-19 00:00 |
21:40:41.94 |
-09:44:04.7 |
HIP 107001 |
8.24 |
| 2026-02-19 12:00 |
21:41:11.10 |
-09:41:46.8 |
HIP 107001 |
15.75 |
| 2026-02-20 00:00 |
21:41:40.23 |
-09:39:28.7 |
HIP 107001 |
23.27 |
| 2026-02-20 12:00 |
21:42:09.33 |
-09:37:10.3 |
HIP 107001 |
30.80 |
| 2026-02-21 00:00 |
21:42:38.41 |
-09:34:51.6 |
HIP 107266 |
28.44 |
| 2026-02-21 12:00 |
21:43:07.46 |
-09:32:32.8 |
HIP 107266 |
27.91 |
| 2026-02-22 00:00 |
21:43:36.48 |
-09:30:13.6 |
HIP 107266 |
29.38 |
| 2026-02-22 12:00 |
21:44:05.48 |
-09:27:54.3 |
HIP 107382 |
26.64 |
| 2026-02-23 00:00 |
21:44:34.45 |
-09:25:34.7 |
HIP 107382 |
21.59 |
| 2026-02-23 12:00 |
21:45:03.39 |
-09:23:14.9 |
HIP 107382 |
18.32 |
| 2026-02-24 00:00 |
21:45:32.30 |
-09:20:54.9 |
HIP 107487 |
11.69 |