| 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) |
| 2026-09-20 00:00 |
02:49:31.55 |
+37:47:14.9 |
HIP 13028 |
24.47 |
| 2026-09-20 12:00 |
02:49:29.83 |
+37:47:17.1 |
HIP 13028 |
24.13 |
| 2026-09-21 00:00 |
02:49:28.09 |
+37:47:19.2 |
HIP 13028 |
23.78 |
| 2026-09-21 12:00 |
02:49:26.35 |
+37:47:21.2 |
HIP 13028 |
23.44 |
| 2026-09-22 00:00 |
02:49:24.58 |
+37:47:23.0 |
HIP 13028 |
23.09 |
| 2026-09-22 12:00 |
02:49:22.80 |
+37:47:24.7 |
HIP 13028 |
22.74 |
| 2026-09-23 00:00 |
02:49:21.00 |
+37:47:26.3 |
HIP 13028 |
22.38 |
| 2026-09-23 12:00 |
02:49:19.19 |
+37:47:27.8 |
HIP 13028 |
22.03 |
| 2026-09-24 00:00 |
02:49:17.37 |
+37:47:29.2 |
HIP 13028 |
21.66 |
| 2026-09-24 12:00 |
02:49:15.53 |
+37:47:30.4 |
HIP 13028 |
21.30 |
| 2026-09-25 00:00 |
02:49:13.67 |
+37:47:31.5 |
HIP 13028 |
20.93 |
| 2026-09-25 12:00 |
02:49:11.80 |
+37:47:32.5 |
HIP 13028 |
20.56 |
| 2026-09-26 00:00 |
02:49:09.92 |
+37:47:33.4 |
HIP 13028 |
20.19 |
| 2026-09-26 12:00 |
02:49:08.02 |
+37:47:34.2 |
HIP 13028 |
19.82 |
| 2026-09-27 00:00 |
02:49:06.11 |
+37:47:34.8 |
HIP 13028 |
19.44 |
| 2026-09-27 12:00 |
02:49:04.18 |
+37:47:35.4 |
HIP 13028 |
19.06 |
| 2026-09-28 00:00 |
02:49:02.24 |
+37:47:35.8 |
HIP 13028 |
18.68 |
| 2026-09-28 12:00 |
02:49:00.28 |
+37:47:36.0 |
HIP 13028 |
18.29 |
| 2026-09-29 00:00 |
02:48:58.31 |
+37:47:36.2 |
HIP 13028 |
17.90 |
| 2026-09-29 12:00 |
02:48:56.33 |
+37:47:36.2 |
HIP 13028 |
17.51 |
| 2026-09-30 00:00 |
02:48:54.34 |
+37:47:36.2 |
HIP 13028 |
17.11 |
| 2026-09-30 12:00 |
02:48:52.33 |
+37:47:36.0 |
HIP 13028 |
16.72 |
| 2026-10-01 00:00 |
02:48:50.31 |
+37:47:35.6 |
HIP 13028 |
16.32 |
| 2026-10-01 12:00 |
02:48:48.27 |
+37:47:35.2 |
HIP 13028 |
15.92 |
| 2026-10-02 00:00 |
02:48:46.22 |
+37:47:34.6 |
HIP 13028 |
15.51 |
| 2026-10-02 12:00 |
02:48:44.16 |
+37:47:33.9 |
HIP 13028 |
15.10 |
| 2026-10-03 00:00 |
02:48:42.09 |
+37:47:33.1 |
HIP 13028 |
14.69 |
| 2026-10-03 12:00 |
02:48:40.00 |
+37:47:32.2 |
HIP 13028 |
14.28 |
| 2026-10-04 00:00 |
02:48:37.90 |
+37:47:31.1 |
HIP 13028 |
13.87 |
| 2026-10-04 12:00 |
02:48:35.79 |
+37:47:29.9 |
HIP 13028 |
13.45 |
| 2026-10-05 00:00 |
02:48:33.67 |
+37:47:28.6 |
HIP 13028 |
13.03 |
| 2026-10-05 12:00 |
02:48:31.54 |
+37:47:27.2 |
HIP 13028 |
12.61 |
| 2026-10-06 00:00 |
02:48:29.39 |
+37:47:25.7 |
HIP 13028 |
12.19 |
| 2026-10-06 12:00 |
02:48:27.23 |
+37:47:24.0 |
HIP 13028 |
11.76 |
| 2026-10-07 00:00 |
02:48:25.06 |
+37:47:22.2 |
HIP 13028 |
11.33 |
| 2026-10-07 12:00 |
02:48:22.88 |
+37:47:20.3 |
HIP 13028 |
10.90 |
| 2026-10-08 00:00 |
02:48:20.69 |
+37:47:18.2 |
HIP 13028 |
10.47 |
| 2026-10-08 12:00 |
02:48:18.49 |
+37:47:16.1 |
HIP 13028 |
10.03 |
| 2026-10-09 00:00 |
02:48:16.27 |
+37:47:13.8 |
HIP 13028 |
9.60 |
| 2026-10-09 12:00 |
02:48:14.05 |
+37:47:11.3 |
HIP 13028 |
9.16 |
| 2026-10-10 00:00 |
02:48:11.81 |
+37:47:08.8 |
HIP 13028 |
8.72 |
| 2026-10-10 12:00 |
02:48:09.57 |
+37:47:06.2 |
HIP 13028 |
8.28 |
| 2026-10-11 00:00 |
02:48:07.31 |
+37:47:03.4 |
HIP 13028 |
7.84 |