C/1980 L1 (Torres)

Metadata

Parameter Value
Designation C/1980 L1 (Torres)
Type C
Perihelion (tp_cal, UTC) 1980-04-19T20:41:49.355520Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:29Z
Obs used 58
NEO -
M1 6.500
K1 18.250
PC 0.030
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1980-07-25.0000000
e 1.00017950
q (au) 2.583907
a (au) -14395.126523
i (deg) 73.148059
Ω (om, deg) 279.523106
ω (w, deg) 334.966178
M (ma, deg) 0.000055

Magnitude

C/1980 L1 (Torres) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (9.586 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 9.586
n 2.000
gf 0.999
gb -0.529
k 1.000
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)
2026-07-29 00:00 05:07:36.83 +67:14:38.8 HIP 24073 19.69
2026-07-29 12:00 05:07:39.73 +67:14:52.1 HIP 24073 19.59
2026-07-30 00:00 05:07:42.60 +67:15:05.5 HIP 24073 19.51
2026-07-30 12:00 05:07:45.45 +67:15:19.0 HIP 24073 19.44
2026-07-31 00:00 05:07:48.27 +67:15:32.5 HIP 24073 19.38
2026-07-31 12:00 05:07:51.07 +67:15:46.1 HIP 24073 19.32
2026-08-01 00:00 05:07:53.83 +67:15:59.9 HIP 24073 19.28
2026-08-01 12:00 05:07:56.58 +67:16:13.6 HIP 24073 19.24
2026-08-02 00:00 05:07:59.29 +67:16:27.5 HIP 24073 19.21
2026-08-02 12:00 05:08:01.98 +67:16:41.5 HIP 24073 19.20
2026-08-03 00:00 05:08:04.64 +67:16:55.5 HIP 24073 19.19
2026-08-03 12:00 05:08:07.27 +67:17:09.6 HIP 24073 19.19
2026-08-04 00:00 05:08:09.88 +67:17:23.8 HIP 24073 19.20
2026-08-04 12:00 05:08:12.46 +67:17:38.1 HIP 24073 19.22
2026-08-05 00:00 05:08:15.01 +67:17:52.4 HIP 24073 19.25
2026-08-05 12:00 05:08:17.53 +67:18:06.8 HIP 24073 19.28
2026-08-06 00:00 05:08:20.03 +67:18:21.3 HIP 24073 19.33
2026-08-06 12:00 05:08:22.49 +67:18:35.9 HIP 24073 19.38
2026-08-07 00:00 05:08:24.93 +67:18:50.5 HIP 24073 19.44
2026-08-07 12:00 05:08:27.34 +67:19:05.2 HIP 24073 19.52
2026-08-08 00:00 05:08:29.72 +67:19:20.0 HIP 24073 19.59
2026-08-08 12:00 05:08:32.07 +67:19:34.9 HIP 24073 19.68
2026-08-09 00:00 05:08:34.39 +67:19:49.8 HIP 24073 19.77
2026-08-09 12:00 05:08:36.68 +67:20:04.8 HIP 24073 19.88
2026-08-10 00:00 05:08:38.94 +67:20:19.8 HIP 24073 19.99
2026-08-10 12:00 05:08:41.17 +67:20:34.9 HIP 24073 20.10
2026-08-11 00:00 05:08:43.37 +67:20:50.1 HIP 24073 20.23
2026-08-11 12:00 05:08:45.54 +67:21:05.3 HIP 24073 20.36
2026-08-12 00:00 05:08:47.68 +67:21:20.6 HIP 24073 20.50
2026-08-12 12:00 05:08:49.78 +67:21:36.0 HIP 24073 20.64
2026-08-13 00:00 05:08:51.86 +67:21:51.4 HIP 24073 20.79
2026-08-13 12:00 05:08:53.91 +67:22:06.9 HIP 24073 20.95
2026-08-14 00:00 05:08:55.92 +67:22:22.4 HIP 24073 21.11
2026-08-14 12:00 05:08:57.90 +67:22:38.0 HIP 24073 21.28
2026-08-15 00:00 05:08:59.85 +67:22:53.7 HIP 24073 21.45
2026-08-15 12:00 05:09:01.77 +67:23:09.4 HIP 24073 21.63
2026-08-16 00:00 05:09:03.66 +67:23:25.2 HIP 24073 21.82
2026-08-16 12:00 05:09:05.51 +67:23:41.0 HIP 24073 22.01
2026-08-17 00:00 05:09:07.33 +67:23:56.8 HIP 24073 22.20
2026-08-17 12:00 05:09:09.12 +67:24:12.7 HIP 24073 22.40
2026-08-18 00:00 05:09:10.88 +67:24:28.7 HIP 24073 22.60
2026-08-18 12:00 05:09:12.60 +67:24:44.7 HIP 24073 22.81
2026-08-19 00:00 05:09:14.29 +67:25:00.8 HIP 24073 23.02