| 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) |
| 2026-03-26 00:00 |
02:43:20.77 |
+36:55:21.8 |
HIP 12790 |
12.73 |
| 2026-03-26 12:00 |
02:43:22.60 |
+36:55:21.3 |
HIP 12790 |
12.37 |
| 2026-03-27 00:00 |
02:43:24.44 |
+36:55:21.0 |
HIP 12790 |
12.00 |
| 2026-03-27 12:00 |
02:43:26.29 |
+36:55:20.8 |
HIP 12790 |
11.64 |
| 2026-03-28 00:00 |
02:43:28.16 |
+36:55:20.7 |
HIP 12790 |
11.27 |
| 2026-03-28 12:00 |
02:43:30.04 |
+36:55:20.7 |
HIP 12790 |
10.90 |
| 2026-03-29 00:00 |
02:43:31.93 |
+36:55:20.8 |
HIP 12790 |
10.53 |
| 2026-03-29 12:00 |
02:43:33.83 |
+36:55:21.1 |
HIP 12790 |
10.16 |
| 2026-03-30 00:00 |
02:43:35.74 |
+36:55:21.5 |
HIP 12790 |
9.79 |
| 2026-03-30 12:00 |
02:43:37.67 |
+36:55:21.9 |
HIP 12790 |
9.41 |
| 2026-03-31 00:00 |
02:43:39.60 |
+36:55:22.5 |
HIP 12790 |
9.04 |
| 2026-03-31 12:00 |
02:43:41.55 |
+36:55:23.3 |
HIP 12790 |
8.67 |
| 2026-04-01 00:00 |
02:43:43.50 |
+36:55:24.1 |
HIP 12790 |
8.29 |
| 2026-04-01 12:00 |
02:43:45.47 |
+36:55:25.0 |
HIP 12790 |
7.92 |
| 2026-04-02 00:00 |
02:43:47.45 |
+36:55:26.1 |
HIP 12790 |
7.54 |
| 2026-04-02 12:00 |
02:43:49.44 |
+36:55:27.3 |
HIP 12790 |
7.17 |
| 2026-04-03 00:00 |
02:43:51.43 |
+36:55:28.6 |
HIP 12790 |
6.80 |
| 2026-04-03 12:00 |
02:43:53.44 |
+36:55:30.0 |
HIP 12790 |
6.43 |
| 2026-04-04 00:00 |
02:43:55.46 |
+36:55:31.5 |
HIP 12790 |
6.06 |
| 2026-04-04 12:00 |
02:43:57.49 |
+36:55:33.1 |
HIP 12790 |
5.70 |
| 2026-04-05 00:00 |
02:43:59.52 |
+36:55:34.9 |
HIP 12790 |
5.34 |
| 2026-04-05 12:00 |
02:44:01.57 |
+36:55:36.7 |
HIP 12790 |
4.99 |
| 2026-04-06 00:00 |
02:44:03.62 |
+36:55:38.7 |
HIP 12790 |
4.65 |
| 2026-04-06 12:00 |
02:44:05.69 |
+36:55:40.8 |
HIP 12790 |
4.32 |
| 2026-04-07 00:00 |
02:44:07.76 |
+36:55:43.0 |
HIP 12790 |
4.01 |
| 2026-04-07 12:00 |
02:44:09.85 |
+36:55:45.3 |
HIP 12790 |
3.71 |
| 2026-04-08 00:00 |
02:44:11.94 |
+36:55:47.7 |
HIP 12790 |
3.45 |
| 2026-04-08 12:00 |
02:44:14.04 |
+36:55:50.2 |
HIP 12790 |
3.21 |
| 2026-04-09 00:00 |
02:44:16.14 |
+36:55:52.9 |
HIP 12790 |
3.02 |
| 2026-04-09 12:00 |
02:44:18.26 |
+36:55:55.6 |
HIP 12790 |
2.88 |
| 2026-04-10 00:00 |
02:44:20.39 |
+36:55:58.5 |
HIP 12790 |
2.80 |
| 2026-04-10 12:00 |
02:44:22.52 |
+36:56:01.5 |
HIP 12790 |
2.78 |
| 2026-04-11 00:00 |
02:44:24.66 |
+36:56:04.6 |
HIP 12790 |
2.83 |
| 2026-04-11 12:00 |
02:44:26.81 |
+36:56:07.8 |
HIP 12790 |
2.95 |
| 2026-04-12 00:00 |
02:44:28.96 |
+36:56:11.1 |
HIP 12790 |
3.13 |
| 2026-04-12 12:00 |
02:44:31.13 |
+36:56:14.5 |
HIP 12790 |
3.35 |
| 2026-04-13 00:00 |
02:44:33.30 |
+36:56:18.0 |
HIP 12790 |
3.62 |
| 2026-04-13 12:00 |
02:44:35.47 |
+36:56:21.7 |
HIP 12790 |
3.92 |
| 2026-04-14 00:00 |
02:44:37.66 |
+36:56:25.4 |
HIP 12790 |
4.24 |
| 2026-04-14 12:00 |
02:44:39.85 |
+36:56:29.3 |
HIP 12790 |
4.59 |
| 2026-04-15 00:00 |
02:44:42.05 |
+36:56:33.2 |
HIP 12790 |
4.96 |
| 2026-04-15 12:00 |
02:44:44.25 |
+36:56:37.3 |
HIP 12790 |
5.34 |
| 2026-04-16 00:00 |
02:44:46.46 |
+36:56:41.5 |
HIP 12790 |
5.73 |