16P/Brooks 2
| 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) |
| 2026-02-03 00:00 |
16:07:45.02 |
-18:01:17.4 |
HIP 78968 |
8.80 |
| 2026-02-03 12:00 |
16:08:02.05 |
-18:01:48.6 |
HIP 78968 |
12.55 |
| 2026-02-04 00:00 |
16:08:18.94 |
-18:02:19.3 |
HIP 79048 |
12.57 |
| 2026-02-04 12:00 |
16:08:35.70 |
-18:02:49.3 |
HIP 79048 |
13.57 |
| 2026-02-05 00:00 |
16:08:52.32 |
-18:03:18.9 |
HIP 79048 |
15.56 |
| 2026-02-05 12:00 |
16:09:08.80 |
-18:03:47.8 |
HIP 79048 |
18.19 |
| 2026-02-06 00:00 |
16:09:25.14 |
-18:04:16.2 |
HIP 79203 |
17.68 |
| 2026-02-06 12:00 |
16:09:41.33 |
-18:04:44.0 |
HIP 79203 |
16.04 |
| 2026-02-07 00:00 |
16:09:57.39 |
-18:05:11.3 |
HIP 79203 |
15.25 |
| 2026-02-07 12:00 |
16:10:13.29 |
-18:05:37.9 |
HIP 79203 |
15.40 |
| 2026-02-08 00:00 |
16:10:29.06 |
-18:06:04.0 |
HIP 79341 |
16.31 |
| 2026-02-08 12:00 |
16:10:44.67 |
-18:06:29.5 |
HIP 79341 |
13.14 |
| 2026-02-09 00:00 |
16:11:00.14 |
-18:06:54.5 |
HIP 79341 |
10.37 |
| 2026-02-09 12:00 |
16:11:15.46 |
-18:07:18.9 |
HIP 79341 |
8.37 |
| 2026-02-10 00:00 |
16:11:30.63 |
-18:07:42.7 |
HIP 79341 |
7.70 |
| 2026-02-10 12:00 |
16:11:45.64 |
-18:08:05.9 |
HIP 79377 |
7.08 |
| 2026-02-11 00:00 |
16:12:00.50 |
-18:08:28.5 |
HIP 79377 |
5.50 |
| 2026-02-11 12:00 |
16:12:15.21 |
-18:08:50.6 |
HIP 79377 |
5.94 |
| 2026-02-12 00:00 |
16:12:29.76 |
-18:09:12.1 |
HIP 79377 |
8.04 |
| 2026-02-12 12:00 |
16:12:44.16 |
-18:09:33.0 |
HIP 79377 |
10.84 |
| 2026-02-13 00:00 |
16:12:58.40 |
-18:09:53.4 |
HIP 79377 |
13.90 |
| 2026-02-13 12:00 |
16:13:12.47 |
-18:10:13.2 |
HIP 79565 |
12.76 |
| 2026-02-14 00:00 |
16:13:26.39 |
-18:10:32.4 |
HIP 79565 |
9.44 |
| 2026-02-14 12:00 |
16:13:40.14 |
-18:10:51.0 |
HIP 79565 |
6.17 |
| 2026-02-15 00:00 |
16:13:53.73 |
-18:11:09.0 |
HIP 79565 |
2.94 |
| 2026-02-15 12:00 |
16:14:07.16 |
-18:11:26.5 |
HIP 79565 |
0.51 |
| 2026-02-16 00:00 |
16:14:20.42 |
-18:11:43.4 |
HIP 79565 |
3.48 |
| 2026-02-16 12:00 |
16:14:33.51 |
-18:11:59.7 |
HIP 79565 |
6.59 |
| 2026-02-17 00:00 |
16:14:46.44 |
-18:12:15.5 |
HIP 79565 |
9.67 |
| 2026-02-17 12:00 |
16:14:59.19 |
-18:12:30.6 |
HIP 79565 |
12.70 |
| 2026-02-18 00:00 |
16:15:11.78 |
-18:12:45.2 |
HIP 79565 |
15.70 |
| 2026-02-18 12:00 |
16:15:24.19 |
-18:12:59.2 |
HIP 79565 |
18.66 |
| 2026-02-19 00:00 |
16:15:36.43 |
-18:13:12.7 |
HIP 79565 |
21.57 |
| 2026-02-19 12:00 |
16:15:48.50 |
-18:13:25.6 |
HIP 79732 |
23.73 |
| 2026-02-20 00:00 |
16:16:00.39 |
-18:13:37.9 |
HIP 79732 |
22.79 |
| 2026-02-20 12:00 |
16:16:12.10 |
-18:13:49.6 |
HIP 79732 |
22.18 |
| 2026-02-21 00:00 |
16:16:23.64 |
-18:14:00.7 |
HIP 79732 |
21.92 |
| 2026-02-21 12:00 |
16:16:35.00 |
-18:14:11.3 |
HIP 79732 |
22.00 |
| 2026-02-22 00:00 |
16:16:46.18 |
-18:14:21.4 |
HIP 79732 |
22.41 |
| 2026-02-22 12:00 |
16:16:57.18 |
-18:14:30.8 |
HIP 79750 |
22.67 |
| 2026-02-23 00:00 |
16:17:07.99 |
-18:14:39.7 |
HIP 79750 |
23.17 |
| 2026-02-23 12:00 |
16:17:18.63 |
-18:14:48.0 |
HIP 79750 |
23.92 |
| 2026-02-24 00:00 |
16:17:29.08 |
-18:14:55.7 |
HIP 79750 |
24.90 |