| Parameter |
Value |
| Designation |
P/2016 P5 (COIAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-06-01T10:27:54.313920Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:02Z |
| Obs used |
239 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
16.750 |
| 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) |
2022-02-06.0000000 |
| e |
0.05781852 |
| q (au) |
4.432558 |
| a (au) |
4.704569 |
| i (deg) |
7.037249 |
| Ω (om, deg) |
185.406308 |
| ω (w, deg) |
34.972005 |
| M (ma, deg) |
313.595523 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.138 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.138 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.703 |
| 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 |
23:01:13.01 |
-02:00:59.1 |
HIP 113547 |
32.88 |
| 2026-07-29 12:00 |
23:01:04.37 |
-02:01:58.2 |
HIP 113547 |
30.77 |
| 2026-07-30 00:00 |
23:00:55.56 |
-02:02:58.5 |
HIP 113547 |
28.66 |
| 2026-07-30 12:00 |
23:00:46.60 |
-02:04:00.1 |
HIP 113547 |
26.56 |
| 2026-07-31 00:00 |
23:00:37.48 |
-02:05:02.8 |
HIP 113547 |
24.49 |
| 2026-07-31 12:00 |
23:00:28.21 |
-02:06:06.7 |
HIP 113547 |
22.47 |
| 2026-08-01 00:00 |
23:00:18.78 |
-02:07:11.8 |
HIP 113547 |
20.55 |
| 2026-08-01 12:00 |
23:00:09.20 |
-02:08:18.1 |
HIP 113547 |
18.75 |
| 2026-08-02 00:00 |
22:59:59.47 |
-02:09:25.6 |
HIP 113547 |
17.15 |
| 2026-08-02 12:00 |
22:59:49.59 |
-02:10:34.2 |
HIP 113547 |
15.82 |
| 2026-08-03 00:00 |
22:59:39.56 |
-02:11:44.0 |
HIP 113547 |
14.86 |
| 2026-08-03 12:00 |
22:59:29.38 |
-02:12:54.9 |
HIP 113547 |
14.38 |
| 2026-08-04 00:00 |
22:59:19.06 |
-02:14:07.0 |
HIP 113547 |
14.43 |
| 2026-08-04 12:00 |
22:59:08.59 |
-02:15:20.3 |
HIP 113547 |
15.04 |
| 2026-08-05 00:00 |
22:58:57.98 |
-02:16:34.6 |
HIP 113421 |
12.78 |
| 2026-08-05 12:00 |
22:58:47.23 |
-02:17:50.1 |
HIP 113421 |
9.86 |
| 2026-08-06 00:00 |
22:58:36.33 |
-02:19:06.7 |
HIP 113421 |
6.94 |
| 2026-08-06 12:00 |
22:58:25.30 |
-02:20:24.5 |
HIP 113421 |
4.11 |
| 2026-08-07 00:00 |
22:58:14.14 |
-02:21:43.3 |
HIP 113421 |
2.03 |
| 2026-08-07 12:00 |
22:58:02.83 |
-02:23:03.2 |
HIP 113421 |
3.24 |
| 2026-08-08 00:00 |
22:57:51.40 |
-02:24:24.2 |
HIP 113421 |
6.07 |
| 2026-08-08 12:00 |
22:57:39.83 |
-02:25:46.2 |
HIP 113421 |
9.15 |
| 2026-08-09 00:00 |
22:57:28.14 |
-02:27:09.3 |
HIP 113421 |
12.33 |
| 2026-08-09 12:00 |
22:57:16.31 |
-02:28:33.5 |
HIP 113421 |
15.57 |
| 2026-08-10 00:00 |
22:57:04.36 |
-02:29:58.7 |
HIP 113421 |
18.85 |
| 2026-08-10 12:00 |
22:56:52.29 |
-02:31:24.9 |
HIP 113421 |
22.17 |
| 2026-08-11 00:00 |
22:56:40.10 |
-02:32:52.2 |
HIP 113421 |
25.53 |
| 2026-08-11 12:00 |
22:56:27.78 |
-02:34:20.4 |
HIP 113421 |
28.93 |
| 2026-08-12 00:00 |
22:56:15.35 |
-02:35:49.6 |
HIP 113421 |
32.37 |
| 2026-08-12 12:00 |
22:56:02.81 |
-02:37:19.8 |
HIP 113101 |
29.92 |
| 2026-08-13 00:00 |
22:55:50.15 |
-02:38:51.0 |
HIP 113101 |
26.42 |
| 2026-08-13 12:00 |
22:55:37.39 |
-02:40:23.1 |
HIP 113101 |
22.89 |
| 2026-08-14 00:00 |
22:55:24.51 |
-02:41:56.1 |
HIP 113101 |
19.32 |
| 2026-08-14 12:00 |
22:55:11.53 |
-02:43:30.1 |
HIP 113101 |
15.73 |
| 2026-08-15 00:00 |
22:54:58.45 |
-02:45:05.0 |
HIP 113101 |
12.12 |
| 2026-08-15 12:00 |
22:54:45.27 |
-02:46:40.7 |
HIP 113101 |
8.48 |
| 2026-08-16 00:00 |
22:54:31.98 |
-02:48:17.3 |
HIP 113101 |
4.86 |
| 2026-08-16 12:00 |
22:54:18.61 |
-02:49:54.8 |
HIP 113101 |
1.56 |
| 2026-08-17 00:00 |
22:54:05.14 |
-02:51:33.1 |
HIP 113101 |
2.99 |
| 2026-08-17 12:00 |
22:53:51.58 |
-02:53:12.2 |
HIP 113101 |
6.62 |
| 2026-08-18 00:00 |
22:53:37.93 |
-02:54:52.2 |
HIP 113101 |
10.37 |
| 2026-08-18 12:00 |
22:53:24.20 |
-02:56:32.9 |
HIP 113101 |
14.17 |
| 2026-08-19 00:00 |
22:53:10.38 |
-02:58:14.4 |
HIP 113101 |
18.00 |