C/1992 J2 (Bradfield)
| Parameter |
Value |
| Designation |
C/1992 J2 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-05-25T19:03:09.063360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:43Z |
| Obs used |
13 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1992-05-19.0000000 |
| e |
1.00000000 |
| q (au) |
0.592320 |
| a (au) |
- |
| i (deg) |
158.564625 |
| Ω (om, deg) |
160.008049 |
| ω (w, deg) |
299.721515 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (11.892 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.892 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
02:41:40.38 |
+37:06:04.3 |
HIP 12678 |
15.13 |
| 2026-02-03 12:00 |
02:41:40.37 |
+37:05:52.9 |
HIP 12678 |
15.19 |
| 2026-02-04 00:00 |
02:41:40.39 |
+37:05:41.5 |
HIP 12678 |
15.24 |
| 2026-02-04 12:00 |
02:41:40.43 |
+37:05:30.2 |
HIP 12678 |
15.29 |
| 2026-02-05 00:00 |
02:41:40.48 |
+37:05:19.0 |
HIP 12678 |
15.34 |
| 2026-02-05 12:00 |
02:41:40.57 |
+37:05:07.9 |
HIP 12678 |
15.39 |
| 2026-02-06 00:00 |
02:41:40.67 |
+37:04:56.9 |
HIP 12678 |
15.44 |
| 2026-02-06 12:00 |
02:41:40.79 |
+37:04:46.0 |
HIP 12678 |
15.48 |
| 2026-02-07 00:00 |
02:41:40.94 |
+37:04:35.1 |
HIP 12678 |
15.52 |
| 2026-02-07 12:00 |
02:41:41.10 |
+37:04:24.3 |
HIP 12678 |
15.56 |
| 2026-02-08 00:00 |
02:41:41.29 |
+37:04:13.7 |
HIP 12678 |
15.59 |
| 2026-02-08 12:00 |
02:41:41.50 |
+37:04:03.1 |
HIP 12678 |
15.63 |
| 2026-02-09 00:00 |
02:41:41.73 |
+37:03:52.6 |
HIP 12678 |
15.66 |
| 2026-02-09 12:00 |
02:41:41.98 |
+37:03:42.2 |
HIP 12678 |
15.69 |
| 2026-02-10 00:00 |
02:41:42.25 |
+37:03:31.8 |
HIP 12678 |
15.71 |
| 2026-02-10 12:00 |
02:41:42.55 |
+37:03:21.6 |
HIP 12678 |
15.74 |
| 2026-02-11 00:00 |
02:41:42.86 |
+37:03:11.5 |
HIP 12678 |
15.76 |
| 2026-02-11 12:00 |
02:41:43.20 |
+37:03:01.5 |
HIP 12678 |
15.78 |
| 2026-02-12 00:00 |
02:41:43.55 |
+37:02:51.5 |
HIP 12678 |
15.79 |
| 2026-02-12 12:00 |
02:41:43.93 |
+37:02:41.7 |
HIP 12678 |
15.81 |
| 2026-02-13 00:00 |
02:41:44.33 |
+37:02:31.9 |
HIP 12678 |
15.82 |
| 2026-02-13 12:00 |
02:41:44.75 |
+37:02:22.3 |
HIP 12678 |
15.83 |
| 2026-02-14 00:00 |
02:41:45.19 |
+37:02:12.7 |
HIP 12678 |
15.83 |
| 2026-02-14 12:00 |
02:41:45.65 |
+37:02:03.2 |
HIP 12678 |
15.84 |
| 2026-02-15 00:00 |
02:41:46.14 |
+37:01:53.9 |
HIP 12678 |
15.84 |
| 2026-02-15 12:00 |
02:41:46.64 |
+37:01:44.6 |
HIP 12678 |
15.84 |
| 2026-02-16 00:00 |
02:41:47.16 |
+37:01:35.5 |
HIP 12678 |
15.84 |
| 2026-02-16 12:00 |
02:41:47.71 |
+37:01:26.4 |
HIP 12678 |
15.83 |
| 2026-02-17 00:00 |
02:41:48.27 |
+37:01:17.4 |
HIP 12678 |
15.83 |
| 2026-02-17 12:00 |
02:41:48.86 |
+37:01:08.6 |
HIP 12678 |
15.82 |
| 2026-02-18 00:00 |
02:41:49.47 |
+37:00:59.8 |
HIP 12678 |
15.81 |
| 2026-02-18 12:00 |
02:41:50.09 |
+37:00:51.2 |
HIP 12678 |
15.79 |
| 2026-02-19 00:00 |
02:41:50.74 |
+37:00:42.6 |
HIP 12678 |
15.78 |
| 2026-02-19 12:00 |
02:41:51.41 |
+37:00:34.2 |
HIP 12678 |
15.76 |
| 2026-02-20 00:00 |
02:41:52.09 |
+37:00:25.8 |
HIP 12678 |
15.74 |
| 2026-02-20 12:00 |
02:41:52.80 |
+37:00:17.6 |
HIP 12678 |
15.72 |
| 2026-02-21 00:00 |
02:41:53.53 |
+37:00:09.5 |
HIP 12678 |
15.70 |
| 2026-02-21 12:00 |
02:41:54.28 |
+37:00:01.4 |
HIP 12678 |
15.68 |
| 2026-02-22 00:00 |
02:41:55.04 |
+36:59:53.5 |
HIP 12678 |
15.65 |
| 2026-02-22 12:00 |
02:41:55.83 |
+36:59:45.7 |
HIP 12678 |
15.63 |
| 2026-02-23 00:00 |
02:41:56.64 |
+36:59:38.0 |
HIP 12678 |
15.60 |
| 2026-02-23 12:00 |
02:41:57.46 |
+36:59:30.4 |
HIP 12678 |
15.57 |
| 2026-02-24 00:00 |
02:41:58.31 |
+36:59:22.9 |
HIP 12678 |
15.54 |