C/2012 C2 (Bruenjes)
| 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
$$
M_a = (16.396 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.396 |
| 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) |
| 2026-02-03 00:00 |
16:57:37.65 |
-34:23:05.1 |
HIP 83022 |
3.56 |
| 2026-02-03 12:00 |
16:57:39.80 |
-34:23:17.9 |
HIP 83022 |
3.07 |
| 2026-02-04 00:00 |
16:57:41.92 |
-34:23:30.8 |
HIP 83022 |
2.59 |
| 2026-02-04 12:00 |
16:57:44.01 |
-34:23:43.6 |
HIP 83022 |
2.11 |
| 2026-02-05 00:00 |
16:57:46.06 |
-34:23:56.4 |
HIP 83022 |
1.65 |
| 2026-02-05 12:00 |
16:57:48.08 |
-34:24:09.3 |
HIP 83022 |
1.20 |
| 2026-02-06 00:00 |
16:57:50.07 |
-34:24:22.1 |
HIP 83022 |
0.77 |
| 2026-02-06 12:00 |
16:57:52.03 |
-34:24:35.0 |
HIP 83022 |
0.44 |
| 2026-02-07 00:00 |
16:57:53.95 |
-34:24:47.9 |
HIP 83022 |
0.45 |
| 2026-02-07 12:00 |
16:57:55.84 |
-34:25:00.7 |
HIP 83022 |
0.79 |
| 2026-02-08 00:00 |
16:57:57.70 |
-34:25:13.6 |
HIP 83022 |
1.19 |
| 2026-02-08 12:00 |
16:57:59.52 |
-34:25:26.5 |
HIP 83022 |
1.61 |
| 2026-02-09 00:00 |
16:58:01.31 |
-34:25:39.4 |
HIP 83022 |
2.03 |
| 2026-02-09 12:00 |
16:58:03.06 |
-34:25:52.2 |
HIP 83022 |
2.44 |
| 2026-02-10 00:00 |
16:58:04.78 |
-34:26:05.1 |
HIP 83022 |
2.85 |
| 2026-02-10 12:00 |
16:58:06.47 |
-34:26:18.0 |
HIP 83022 |
3.26 |
| 2026-02-11 00:00 |
16:58:08.12 |
-34:26:30.9 |
HIP 83022 |
3.66 |
| 2026-02-11 12:00 |
16:58:09.74 |
-34:26:43.7 |
HIP 83022 |
4.06 |
| 2026-02-12 00:00 |
16:58:11.32 |
-34:26:56.6 |
HIP 83022 |
4.45 |
| 2026-02-12 12:00 |
16:58:12.87 |
-34:27:09.5 |
HIP 83022 |
4.83 |
| 2026-02-13 00:00 |
16:58:14.38 |
-34:27:22.3 |
HIP 83022 |
5.21 |
| 2026-02-13 12:00 |
16:58:15.86 |
-34:27:35.2 |
HIP 83022 |
5.58 |
| 2026-02-14 00:00 |
16:58:17.30 |
-34:27:48.0 |
HIP 83022 |
5.95 |
| 2026-02-14 12:00 |
16:58:18.70 |
-34:28:00.9 |
HIP 83022 |
6.31 |
| 2026-02-15 00:00 |
16:58:20.07 |
-34:28:13.7 |
HIP 83022 |
6.66 |
| 2026-02-15 12:00 |
16:58:21.41 |
-34:28:26.5 |
HIP 83067 |
6.96 |
| 2026-02-16 00:00 |
16:58:22.70 |
-34:28:39.3 |
HIP 83067 |
6.73 |
| 2026-02-16 12:00 |
16:58:23.97 |
-34:28:52.1 |
HIP 83067 |
6.51 |
| 2026-02-17 00:00 |
16:58:25.19 |
-34:29:04.9 |
HIP 83067 |
6.30 |
| 2026-02-17 12:00 |
16:58:26.38 |
-34:29:17.7 |
HIP 83067 |
6.10 |
| 2026-02-18 00:00 |
16:58:27.53 |
-34:29:30.4 |
HIP 83067 |
5.91 |
| 2026-02-18 12:00 |
16:58:28.65 |
-34:29:43.2 |
HIP 83067 |
5.74 |
| 2026-02-19 00:00 |
16:58:29.72 |
-34:29:55.9 |
HIP 83067 |
5.57 |
| 2026-02-19 12:00 |
16:58:30.77 |
-34:30:08.6 |
HIP 83067 |
5.41 |
| 2026-02-20 00:00 |
16:58:31.77 |
-34:30:21.3 |
HIP 83067 |
5.26 |
| 2026-02-20 12:00 |
16:58:32.74 |
-34:30:34.0 |
HIP 83067 |
5.13 |
| 2026-02-21 00:00 |
16:58:33.67 |
-34:30:46.6 |
HIP 83067 |
5.00 |
| 2026-02-21 12:00 |
16:58:34.56 |
-34:30:59.3 |
HIP 83067 |
4.88 |
| 2026-02-22 00:00 |
16:58:35.41 |
-34:31:11.9 |
HIP 83067 |
4.78 |
| 2026-02-22 12:00 |
16:58:36.23 |
-34:31:24.5 |
HIP 83067 |
4.68 |
| 2026-02-23 00:00 |
16:58:37.01 |
-34:31:37.0 |
HIP 83067 |
4.60 |
| 2026-02-23 12:00 |
16:58:37.75 |
-34:31:49.6 |
HIP 83067 |
4.52 |
| 2026-02-24 00:00 |
16:58:38.46 |
-34:32:02.1 |
HIP 83067 |
4.45 |