C/1992 Q2 (Helin-Lawrence)

Metadata

Parameter Value
Designation C/1992 Q2 (Helin-Lawrence)
Type C
Perihelion (tp_cal, UTC) 1993-03-15T02:37:57.362880Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:43Z
Obs used 86
NEO -
M1 6.000
K1 15.000
PC 0.030
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1993-02-15.0000000
e 0.96541828
q (au) 2.038458
a (au) 58.946112
i (deg) 106.848257
Ω (om, deg) 194.667114
ω (w, deg) 268.852796
M (ma, deg) 359.938782

Magnitude

C/1992 Q2 (Helin-Lawrence) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (8.372 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 8.372
n 6.000
gf 1.000
gb -0.705
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)
2026-07-29 00:00 13:37:11.76 +64:38:31.9 HIP 66798 29.58
2026-07-29 12:00 13:37:12.69 +64:38:00.0 HIP 66798 29.70
2026-07-30 00:00 13:37:13.65 +64:37:28.0 HIP 66798 29.81
2026-07-30 12:00 13:37:14.66 +64:36:56.1 HIP 66798 29.94
2026-07-31 00:00 13:37:15.70 +64:36:24.2 HIP 66798 30.06
2026-07-31 12:00 13:37:16.79 +64:35:52.3 HIP 66798 30.20
2026-08-01 00:00 13:37:17.92 +64:35:20.5 HIP 66798 30.33
2026-08-01 12:00 13:37:19.08 +64:34:48.7 HIP 66798 30.48
2026-08-02 00:00 13:37:20.29 +64:34:17.0 HIP 66798 30.62
2026-08-02 12:00 13:37:21.54 +64:33:45.3 HIP 66798 30.77
2026-08-03 00:00 13:37:22.83 +64:33:13.6 HIP 66798 30.93
2026-08-03 12:00 13:37:24.16 +64:32:42.0 HIP 66798 31.09
2026-08-04 00:00 13:37:25.52 +64:32:10.4 HIP 66798 31.26
2026-08-04 12:00 13:37:26.93 +64:31:38.8 HIP 66798 31.43
2026-08-05 00:00 13:37:28.38 +64:31:07.3 HIP 66798 31.61
2026-08-05 12:00 13:37:29.86 +64:30:35.9 HIP 66798 31.79
2026-08-06 00:00 13:37:31.39 +64:30:04.5 HIP 66798 31.97
2026-08-06 12:00 13:37:32.95 +64:29:33.2 HIP 66798 32.16
2026-08-07 00:00 13:37:34.56 +64:29:01.9 HIP 66798 32.35
2026-08-07 12:00 13:37:36.20 +64:28:30.7 HIP 66798 32.55
2026-08-08 00:00 13:37:37.88 +64:27:59.6 HIP 66798 32.75
2026-08-08 12:00 13:37:39.60 +64:27:28.5 HIP 66798 32.95
2026-08-09 00:00 13:37:41.36 +64:26:57.5 HIP 66798 33.16
2026-08-09 12:00 13:37:43.16 +64:26:26.5 HIP 66798 33.38
2026-08-10 00:00 13:37:45.00 +64:25:55.6 HIP 66798 33.59
2026-08-10 12:00 13:37:46.88 +64:25:24.8 HIP 66798 33.81
2026-08-11 00:00 13:37:48.79 +64:24:54.1 HIP 66798 34.04
2026-08-11 12:00 13:37:50.74 +64:24:23.5 HIP 66798 34.26
2026-08-12 00:00 13:37:52.73 +64:23:52.9 HIP 66798 34.50
2026-08-12 12:00 13:37:54.76 +64:23:22.4 HIP 66798 34.73
2026-08-13 00:00 13:37:56.82 +64:22:52.0 HIP 66798 34.97
2026-08-13 12:00 13:37:58.92 +64:22:21.7 HIP 66798 35.21
2026-08-14 00:00 13:38:01.06 +64:21:51.5 HIP 66798 35.45
2026-08-14 12:00 13:38:03.24 +64:21:21.3 HIP 66769 35.57
2026-08-15 00:00 13:38:05.45 +64:20:51.3 HIP 66769 35.03
2026-08-15 12:00 13:38:07.70 +64:20:21.4 HIP 66769 34.48
2026-08-16 00:00 13:38:09.99 +64:19:51.5 HIP 66769 33.93
2026-08-16 12:00 13:38:12.31 +64:19:21.8 HIP 66769 33.38
2026-08-17 00:00 13:38:14.67 +64:18:52.2 HIP 66769 32.83
2026-08-17 12:00 13:38:17.06 +64:18:22.7 HIP 66769 32.28
2026-08-18 00:00 13:38:19.49 +64:17:53.2 HIP 66769 31.72
2026-08-18 12:00 13:38:21.96 +64:17:23.9 HIP 66769 31.17
2026-08-19 00:00 13:38:24.46 +64:16:54.7 HIP 66769 30.62