| 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) |
| 2026-03-26 00:00 |
16:21:44.96 |
-18:05:39.0 |
HIP 80165 |
28.47 |
| 2026-03-26 12:00 |
16:21:42.53 |
-18:05:13.0 |
HIP 80165 |
28.94 |
| 2026-03-27 00:00 |
16:21:39.86 |
-18:04:46.5 |
HIP 80083 |
29.44 |
| 2026-03-27 12:00 |
16:21:36.96 |
-18:04:19.5 |
HIP 80083 |
28.71 |
| 2026-03-28 00:00 |
16:21:33.84 |
-18:03:52.0 |
HIP 80083 |
27.97 |
| 2026-03-28 12:00 |
16:21:30.48 |
-18:03:23.9 |
HIP 80083 |
27.19 |
| 2026-03-29 00:00 |
16:21:26.90 |
-18:02:55.3 |
HIP 80083 |
26.40 |
| 2026-03-29 12:00 |
16:21:23.08 |
-18:02:26.2 |
HIP 80083 |
25.59 |
| 2026-03-30 00:00 |
16:21:19.04 |
-18:01:56.6 |
HIP 80083 |
24.77 |
| 2026-03-30 12:00 |
16:21:14.77 |
-18:01:26.5 |
HIP 80083 |
23.94 |
| 2026-03-31 00:00 |
16:21:10.27 |
-18:00:55.8 |
HIP 80083 |
23.11 |
| 2026-03-31 12:00 |
16:21:05.54 |
-18:00:24.6 |
HIP 80083 |
22.29 |
| 2026-04-01 00:00 |
16:21:00.57 |
-17:59:52.9 |
HIP 80083 |
21.49 |
| 2026-04-01 12:00 |
16:20:55.39 |
-17:59:20.7 |
HIP 80083 |
20.73 |
| 2026-04-02 00:00 |
16:20:49.97 |
-17:58:48.0 |
HIP 80083 |
20.01 |
| 2026-04-02 12:00 |
16:20:44.32 |
-17:58:14.8 |
HIP 80083 |
19.35 |
| 2026-04-03 00:00 |
16:20:38.44 |
-17:57:41.1 |
HIP 80083 |
18.78 |
| 2026-04-03 12:00 |
16:20:32.34 |
-17:57:06.8 |
HIP 80083 |
18.31 |
| 2026-04-04 00:00 |
16:20:26.00 |
-17:56:32.1 |
HIP 80083 |
17.97 |
| 2026-04-04 12:00 |
16:20:19.44 |
-17:55:56.8 |
HIP 80083 |
17.78 |
| 2026-04-05 00:00 |
16:20:12.65 |
-17:55:21.1 |
HIP 80083 |
17.75 |
| 2026-04-05 12:00 |
16:20:05.63 |
-17:54:44.8 |
HIP 80083 |
17.91 |
| 2026-04-06 00:00 |
16:19:58.38 |
-17:54:08.1 |
HIP 80083 |
18.27 |
| 2026-04-06 12:00 |
16:19:50.91 |
-17:53:30.8 |
HIP 80083 |
18.82 |
| 2026-04-07 00:00 |
16:19:43.21 |
-17:52:53.0 |
HIP 80083 |
19.57 |
| 2026-04-07 12:00 |
16:19:35.28 |
-17:52:14.8 |
HIP 80083 |
20.52 |
| 2026-04-08 00:00 |
16:19:27.13 |
-17:51:36.0 |
HIP 80083 |
21.65 |
| 2026-04-08 12:00 |
16:19:18.75 |
-17:50:56.8 |
HIP 80083 |
22.94 |
| 2026-04-09 00:00 |
16:19:10.14 |
-17:50:17.0 |
HIP 80083 |
24.40 |
| 2026-04-09 12:00 |
16:19:01.32 |
-17:49:36.8 |
HIP 80083 |
25.99 |
| 2026-04-10 00:00 |
16:18:52.26 |
-17:48:56.1 |
HIP 79895 |
26.37 |
| 2026-04-10 12:00 |
16:18:42.99 |
-17:48:14.9 |
HIP 79895 |
25.28 |
| 2026-04-11 00:00 |
16:18:33.49 |
-17:47:33.2 |
HIP 79895 |
24.35 |
| 2026-04-11 12:00 |
16:18:23.77 |
-17:46:51.1 |
HIP 79895 |
23.61 |
| 2026-04-12 00:00 |
16:18:13.83 |
-17:46:08.4 |
HIP 79895 |
23.10 |
| 2026-04-12 12:00 |
16:18:03.67 |
-17:45:25.3 |
HIP 79895 |
22.86 |
| 2026-04-13 00:00 |
16:17:53.29 |
-17:44:41.7 |
HIP 79895 |
22.91 |
| 2026-04-13 12:00 |
16:17:42.69 |
-17:43:57.7 |
HIP 79895 |
23.26 |
| 2026-04-14 00:00 |
16:17:31.87 |
-17:43:13.2 |
HIP 79895 |
23.92 |
| 2026-04-14 12:00 |
16:17:20.84 |
-17:42:28.2 |
HIP 79895 |
24.88 |
| 2026-04-15 00:00 |
16:17:09.59 |
-17:41:42.8 |
HIP 79895 |
26.12 |
| 2026-04-15 12:00 |
16:16:58.13 |
-17:40:56.9 |
HIP 79895 |
27.62 |
| 2026-04-16 00:00 |
16:16:46.45 |
-17:40:10.5 |
HIP 79895 |
29.36 |