C/1978 T3 (Bradfield)

Metadata

Parameter Value
Designation C/1978 T3 (Bradfield)
Type C
Perihelion (tp_cal, UTC) 1978-09-29T02:01:57.146880Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:27Z
Obs used 14
NEO -
M1 -
K1 -
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1978-10-19.0000000
e 0.99999921
q (au) 0.431792
a (au) 547482.576663
i (deg) 138.267856
Ω (om, deg) 358.421984
ω (w, deg) 240.439277
M (ma, deg) 0.000000

Magnitude

C/1978 T3 (Bradfield) · Magnitude (Full range)

C/1978 T3 (Bradfield) · Magnitude (Highlight period)

Scatter + Global Linear

$$ M_a = (12.272 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 12.272
n 2.000
gf 1.000
gb -1.000
k 0.800
δ90 10.000
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)
2026-05-12 00:00 20:37:15.82 +14:08:42.5 HIP 101769 27.32
2026-05-12 12:00 20:37:15.42 +14:08:54.0 HIP 101769 27.14
2026-05-13 00:00 20:37:15.01 +14:09:05.4 HIP 101769 26.97
2026-05-13 12:00 20:37:14.59 +14:09:16.7 HIP 101769 26.80
2026-05-14 00:00 20:37:14.15 +14:09:27.9 HIP 101769 26.64
2026-05-14 12:00 20:37:13.70 +14:09:39.1 HIP 101769 26.47
2026-05-15 00:00 20:37:13.24 +14:09:50.2 HIP 101769 26.31
2026-05-15 12:00 20:37:12.76 +14:10:01.2 HIP 101769 26.15
2026-05-16 00:00 20:37:12.28 +14:10:12.2 HIP 101769 25.99
2026-05-16 12:00 20:37:11.77 +14:10:23.1 HIP 101769 25.84
2026-05-17 00:00 20:37:11.26 +14:10:33.9 HIP 101769 25.69
2026-05-17 12:00 20:37:10.73 +14:10:44.6 HIP 101769 25.54
2026-05-18 00:00 20:37:10.19 +14:10:55.3 HIP 101769 25.39
2026-05-18 12:00 20:37:09.64 +14:11:05.8 HIP 101769 25.25
2026-05-19 00:00 20:37:09.07 +14:11:16.3 HIP 101769 25.11
2026-05-19 12:00 20:37:08.49 +14:11:26.8 HIP 101769 24.97
2026-05-20 00:00 20:37:07.90 +14:11:37.1 HIP 101769 24.84
2026-05-20 12:00 20:37:07.29 +14:11:47.4 HIP 101769 24.71
2026-05-21 00:00 20:37:06.68 +14:11:57.6 HIP 101769 24.59
2026-05-21 12:00 20:37:06.05 +14:12:07.7 HIP 101769 24.46
2026-05-22 00:00 20:37:05.40 +14:12:17.7 HIP 101769 24.34
2026-05-22 12:00 20:37:04.75 +14:12:27.6 HIP 101769 24.23
2026-05-23 00:00 20:37:04.08 +14:12:37.5 HIP 101769 24.12
2026-05-23 12:00 20:37:03.40 +14:12:47.2 HIP 101769 24.01
2026-05-24 00:00 20:37:02.71 +14:12:56.9 HIP 101769 23.91
2026-05-24 12:00 20:37:02.00 +14:13:06.5 HIP 101769 23.81
2026-05-25 00:00 20:37:01.29 +14:13:16.0 HIP 101769 23.71
2026-05-25 12:00 20:37:00.56 +14:13:25.5 HIP 101769 23.62
2026-05-26 00:00 20:36:59.82 +14:13:34.8 HIP 101769 23.53
2026-05-26 12:00 20:36:59.06 +14:13:44.0 HIP 101769 23.45
2026-05-27 00:00 20:36:58.30 +14:13:53.2 HIP 101769 23.38
2026-05-27 12:00 20:36:57.52 +14:14:02.3 HIP 101769 23.30
2026-05-28 00:00 20:36:56.73 +14:14:11.3 HIP 101769 23.24
2026-05-28 12:00 20:36:55.93 +14:14:20.2 HIP 101769 23.17
2026-05-29 00:00 20:36:55.12 +14:14:29.0 HIP 101769 23.11
2026-05-29 12:00 20:36:54.29 +14:14:37.7 HIP 101769 23.06
2026-05-30 00:00 20:36:53.46 +14:14:46.3 HIP 101769 23.01
2026-05-30 12:00 20:36:52.61 +14:14:54.8 HIP 101769 22.97
2026-05-31 00:00 20:36:51.75 +14:15:03.2 HIP 101769 22.93
2026-05-31 12:00 20:36:50.88 +14:15:11.6 HIP 101769 22.90
2026-06-01 00:00 20:36:50.00 +14:15:19.8 HIP 101769 22.87
2026-06-01 12:00 20:36:49.10 +14:15:28.0 HIP 101769 22.85
2026-06-02 00:00 20:36:48.20 +14:15:36.0 HIP 101769 22.84