| Parameter |
Value |
| Designation |
16P/Brooks 2 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-06-14T18:26:56.207040Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T10:04:25Z |
| Obs used |
256 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
13.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-06-12.0000000 |
| e |
0.56897473 |
| q (au) |
1.454508 |
| a (au) |
3.374531 |
| i (deg) |
4.306900 |
| Ω (om, deg) |
159.343017 |
| ω (w, deg) |
220.166046 |
| M (ma, deg) |
115.785261 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.758 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.758 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.543 |
| 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) |
| 2026-05-12 00:00 |
16:02:33.69 |
-16:51:41.6 |
HIP 78664 |
31.08 |
| 2026-05-12 12:00 |
16:02:13.70 |
-16:50:38.9 |
HIP 78664 |
32.71 |
| 2026-05-13 00:00 |
16:01:53.62 |
-16:49:36.2 |
HIP 78400 |
28.54 |
| 2026-05-13 12:00 |
16:01:33.46 |
-16:48:33.3 |
HIP 78400 |
24.20 |
| 2026-05-14 00:00 |
16:01:13.22 |
-16:47:30.3 |
HIP 78400 |
20.12 |
| 2026-05-14 12:00 |
16:00:52.91 |
-16:46:27.2 |
HIP 78400 |
16.52 |
| 2026-05-15 00:00 |
16:00:32.52 |
-16:45:24.1 |
HIP 78400 |
13.79 |
| 2026-05-15 12:00 |
16:00:12.07 |
-16:44:20.9 |
HIP 78400 |
12.55 |
| 2026-05-16 00:00 |
15:59:51.56 |
-16:43:17.6 |
HIP 78400 |
13.24 |
| 2026-05-16 12:00 |
15:59:30.98 |
-16:42:14.3 |
HIP 78400 |
15.61 |
| 2026-05-17 00:00 |
15:59:10.35 |
-16:41:11.0 |
HIP 78400 |
19.07 |
| 2026-05-17 12:00 |
15:58:49.67 |
-16:40:07.7 |
HIP 78171 |
18.45 |
| 2026-05-18 00:00 |
15:58:28.94 |
-16:39:04.3 |
HIP 78171 |
14.89 |
| 2026-05-18 12:00 |
15:58:08.16 |
-16:38:01.0 |
HIP 78171 |
12.42 |
| 2026-05-19 00:00 |
15:57:47.35 |
-16:36:57.6 |
HIP 78171 |
11.77 |
| 2026-05-19 12:00 |
15:57:26.49 |
-16:35:54.3 |
HIP 78171 |
13.22 |
| 2026-05-20 00:00 |
15:57:05.61 |
-16:34:51.1 |
HIP 78064 |
15.44 |
| 2026-05-20 12:00 |
15:56:44.69 |
-16:33:47.8 |
HIP 78064 |
13.42 |
| 2026-05-21 00:00 |
15:56:23.75 |
-16:32:44.7 |
HIP 78064 |
13.20 |
| 2026-05-21 12:00 |
15:56:02.78 |
-16:31:41.6 |
HIP 78064 |
14.86 |
| 2026-05-22 00:00 |
15:55:41.80 |
-16:30:38.6 |
HIP 78064 |
17.89 |
| 2026-05-22 12:00 |
15:55:20.80 |
-16:29:35.6 |
HIP 78064 |
21.73 |
| 2026-05-23 00:00 |
15:54:59.79 |
-16:28:32.8 |
HIP 77853 |
22.71 |
| 2026-05-23 12:00 |
15:54:38.77 |
-16:27:30.1 |
HIP 77853 |
20.11 |
| 2026-05-24 00:00 |
15:54:17.75 |
-16:26:27.5 |
HIP 77793 |
18.50 |
| 2026-05-24 12:00 |
15:53:56.73 |
-16:25:25.1 |
HIP 77793 |
14.63 |
| 2026-05-25 00:00 |
15:53:35.72 |
-16:24:22.7 |
HIP 77793 |
11.78 |
| 2026-05-25 12:00 |
15:53:14.71 |
-16:23:20.6 |
HIP 77793 |
10.78 |
| 2026-05-26 00:00 |
15:52:53.70 |
-16:22:18.6 |
HIP 77793 |
12.10 |
| 2026-05-26 12:00 |
15:52:32.72 |
-16:21:16.8 |
HIP 77793 |
15.14 |
| 2026-05-27 00:00 |
15:52:11.75 |
-16:20:15.2 |
HIP 77793 |
19.10 |
| 2026-05-27 12:00 |
15:51:50.80 |
-16:19:13.7 |
HIP 77793 |
23.51 |
| 2026-05-28 00:00 |
15:51:29.88 |
-16:18:12.5 |
HIP 77793 |
28.16 |
| 2026-05-28 12:00 |
15:51:08.98 |
-16:17:11.5 |
HIP 77663 |
32.20 |
| 2026-05-29 00:00 |
15:50:48.12 |
-16:16:10.7 |
HIP 77663 |
31.89 |
| 2026-05-29 12:00 |
15:50:27.29 |
-16:15:10.2 |
HIP 77663 |
32.40 |
| 2026-05-30 00:00 |
15:50:06.50 |
-16:14:09.9 |
HIP 77663 |
33.69 |
| 2026-05-30 12:00 |
15:49:45.75 |
-16:13:09.9 |
HIP 77663 |
35.66 |
| 2026-05-31 00:00 |
15:49:25.04 |
-16:12:10.2 |
HIP 77334 |
30.74 |
| 2026-05-31 12:00 |
15:49:04.38 |
-16:11:10.7 |
HIP 77334 |
25.74 |
| 2026-06-01 00:00 |
15:48:43.78 |
-16:10:11.5 |
HIP 77334 |
20.79 |
| 2026-06-01 12:00 |
15:48:23.23 |
-16:09:12.7 |
HIP 77334 |
15.90 |
| 2026-06-02 00:00 |
15:48:02.73 |
-16:08:14.1 |
HIP 77334 |
11.16 |