| Parameter |
Value |
| Designation |
C/2012 C2 (Bruenjes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-03-12T15:24:12.444480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:02Z |
| Obs used |
245 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
37.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-02-17.0000000 |
| e |
1.00307783 |
| q (au) |
0.802314 |
| a (au) |
-260.675176 |
| i (deg) |
162.789231 |
| Ω (om, deg) |
117.996689 |
| ω (w, deg) |
62.658603 |
| M (ma, deg) |
-0.005771 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.388 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.388 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
16:53:17.81 |
-34:50:40.1 |
HIP 82739 |
28.43 |
| 2026-05-12 12:00 |
16:53:13.53 |
-34:50:39.4 |
HIP 82739 |
28.97 |
| 2026-05-13 00:00 |
16:53:09.23 |
-34:50:38.6 |
HIP 82739 |
29.53 |
| 2026-05-13 12:00 |
16:53:04.92 |
-34:50:37.7 |
HIP 82739 |
30.11 |
| 2026-05-14 00:00 |
16:53:00.60 |
-34:50:36.6 |
HIP 82739 |
30.71 |
| 2026-05-14 12:00 |
16:52:56.26 |
-34:50:35.4 |
HIP 82739 |
31.32 |
| 2026-05-15 00:00 |
16:52:51.90 |
-34:50:34.1 |
HIP 82739 |
31.95 |
| 2026-05-15 12:00 |
16:52:47.54 |
-34:50:32.7 |
HIP 82739 |
32.60 |
| 2026-05-16 00:00 |
16:52:43.15 |
-34:50:31.2 |
HIP 82739 |
33.26 |
| 2026-05-16 12:00 |
16:52:38.76 |
-34:50:29.5 |
HIP 82739 |
33.94 |
| 2026-05-17 00:00 |
16:52:34.35 |
-34:50:27.7 |
HIP 82739 |
34.63 |
| 2026-05-17 12:00 |
16:52:29.93 |
-34:50:25.8 |
HIP 82739 |
35.33 |
| 2026-05-18 00:00 |
16:52:25.50 |
-34:50:23.8 |
HIP 82739 |
36.04 |
| 2026-05-18 12:00 |
16:52:21.05 |
-34:50:21.6 |
HIP 82739 |
36.77 |
| 2026-05-19 00:00 |
16:52:16.60 |
-34:50:19.3 |
HIP 82739 |
37.50 |
| 2026-05-19 12:00 |
16:52:12.13 |
-34:50:16.9 |
HIP 82739 |
38.25 |
| 2026-05-20 00:00 |
16:52:07.65 |
-34:50:14.4 |
HIP 82300 |
38.96 |
| 2026-05-20 12:00 |
16:52:03.17 |
-34:50:11.7 |
HIP 82300 |
38.05 |
| 2026-05-21 00:00 |
16:51:58.67 |
-34:50:09.0 |
HIP 82300 |
37.13 |
| 2026-05-21 12:00 |
16:51:54.16 |
-34:50:06.1 |
HIP 82300 |
36.21 |
| 2026-05-22 00:00 |
16:51:49.65 |
-34:50:03.1 |
HIP 82300 |
35.28 |
| 2026-05-22 12:00 |
16:51:45.12 |
-34:50:00.0 |
HIP 82300 |
34.36 |
| 2026-05-23 00:00 |
16:51:40.59 |
-34:49:56.7 |
HIP 82300 |
33.44 |
| 2026-05-23 12:00 |
16:51:36.05 |
-34:49:53.3 |
HIP 82300 |
32.51 |
| 2026-05-24 00:00 |
16:51:31.50 |
-34:49:49.8 |
HIP 82300 |
31.58 |
| 2026-05-24 12:00 |
16:51:26.95 |
-34:49:46.2 |
HIP 82300 |
30.66 |
| 2026-05-25 00:00 |
16:51:22.38 |
-34:49:42.5 |
HIP 82300 |
29.73 |
| 2026-05-25 12:00 |
16:51:17.81 |
-34:49:38.6 |
HIP 82300 |
28.80 |
| 2026-05-26 00:00 |
16:51:13.24 |
-34:49:34.6 |
HIP 82300 |
27.87 |
| 2026-05-26 12:00 |
16:51:08.66 |
-34:49:30.6 |
HIP 82300 |
26.94 |
| 2026-05-27 00:00 |
16:51:04.07 |
-34:49:26.3 |
HIP 82300 |
26.01 |
| 2026-05-27 12:00 |
16:50:59.48 |
-34:49:22.0 |
HIP 82300 |
25.08 |
| 2026-05-28 00:00 |
16:50:54.88 |
-34:49:17.6 |
HIP 82300 |
24.15 |
| 2026-05-28 12:00 |
16:50:50.28 |
-34:49:13.0 |
HIP 82300 |
23.22 |
| 2026-05-29 00:00 |
16:50:45.67 |
-34:49:08.3 |
HIP 82300 |
22.29 |
| 2026-05-29 12:00 |
16:50:41.06 |
-34:49:03.5 |
HIP 82300 |
21.37 |
| 2026-05-30 00:00 |
16:50:36.45 |
-34:48:58.6 |
HIP 82300 |
20.44 |
| 2026-05-30 12:00 |
16:50:31.83 |
-34:48:53.6 |
HIP 82300 |
19.52 |
| 2026-05-31 00:00 |
16:50:27.21 |
-34:48:48.5 |
HIP 82300 |
18.60 |
| 2026-05-31 12:00 |
16:50:22.59 |
-34:48:43.2 |
HIP 82300 |
17.68 |
| 2026-06-01 00:00 |
16:50:17.96 |
-34:48:37.9 |
HIP 82300 |
16.77 |
| 2026-06-01 12:00 |
16:50:13.33 |
-34:48:32.4 |
HIP 82300 |
15.86 |
| 2026-06-02 00:00 |
16:50:08.71 |
-34:48:26.8 |
HIP 82300 |
14.95 |