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)
2026-03-26 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