C/1992 J2 (Bradfield)

Metadata

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

C/1992 J2 (Bradfield) · Magnitude (Full range)

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