C/1968 Q1 (Bally-Clayton)

Metadata

Parameter Value
Designation C/1968 Q1 (Bally-Clayton)
Type C
Perihelion (tp_cal, UTC) 1968-08-20T20:17:35.787840Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:19Z
Obs used 52
NEO -
M1 8.500
K1 6.500
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1968-09-19.0000000
e 1.00000000
q (au) 1.771094
a (au) -
i (deg) 93.169377
Ω (om, deg) 319.395346
ω (w, deg) 26.864965
M (ma, deg) -

Magnitude

C/1968 Q1 (Bally-Clayton) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (7.710 + 5.798\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 7.710
n 5.798
gf 1.000
gb -0.782
k 0.800
δ90 9.999
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 09:14:12.77 +05:33:00.2 HIP 45420 16.66
2026-09-20 12:00 09:14:13.77 +05:32:52.6 HIP 45420 16.40
2026-09-21 00:00 09:14:14.76 +05:32:44.9 HIP 45420 16.14
2026-09-21 12:00 09:14:15.75 +05:32:37.3 HIP 45420 15.88
2026-09-22 00:00 09:14:16.73 +05:32:29.6 HIP 45420 15.63
2026-09-22 12:00 09:14:17.69 +05:32:22.0 HIP 45420 15.37
2026-09-23 00:00 09:14:18.66 +05:32:14.4 HIP 45420 15.12
2026-09-23 12:00 09:14:19.61 +05:32:06.8 HIP 45420 14.88
2026-09-24 00:00 09:14:20.55 +05:31:59.2 HIP 45420 14.63
2026-09-24 12:00 09:14:21.49 +05:31:51.6 HIP 45420 14.39
2026-09-25 00:00 09:14:22.42 +05:31:44.1 HIP 45420 14.15
2026-09-25 12:00 09:14:23.34 +05:31:36.5 HIP 45420 13.92
2026-09-26 00:00 09:14:24.25 +05:31:29.0 HIP 45420 13.69
2026-09-26 12:00 09:14:25.16 +05:31:21.5 HIP 45420 13.46
2026-09-27 00:00 09:14:26.05 +05:31:14.0 HIP 45420 13.23
2026-09-27 12:00 09:14:26.94 +05:31:06.5 HIP 45420 13.01
2026-09-28 00:00 09:14:27.82 +05:30:59.0 HIP 45420 12.79
2026-09-28 12:00 09:14:28.69 +05:30:51.6 HIP 45420 12.57
2026-09-29 00:00 09:14:29.55 +05:30:44.1 HIP 45420 12.36
2026-09-29 12:00 09:14:30.40 +05:30:36.7 HIP 45420 12.15
2026-09-30 00:00 09:14:31.25 +05:30:29.3 HIP 45420 11.94
2026-09-30 12:00 09:14:32.08 +05:30:22.0 HIP 45420 11.74
2026-10-01 00:00 09:14:32.91 +05:30:14.6 HIP 45420 11.54
2026-10-01 12:00 09:14:33.72 +05:30:07.2 HIP 45420 11.35
2026-10-02 00:00 09:14:34.53 +05:30:00.0 HIP 45420 11.16
2026-10-02 12:00 09:14:35.33 +05:29:52.6 HIP 45420 10.97
2026-10-03 00:00 09:14:36.12 +05:29:45.3 HIP 45420 10.79
2026-10-03 12:00 09:14:36.90 +05:29:38.1 HIP 45420 10.61
2026-10-04 00:00 09:14:37.67 +05:29:30.9 HIP 45420 10.43
2026-10-04 12:00 09:14:38.43 +05:29:23.6 HIP 45420 10.26
2026-10-05 00:00 09:14:39.19 +05:29:16.5 HIP 45420 10.09
2026-10-05 12:00 09:14:39.93 +05:29:09.3 HIP 45420 9.93
2026-10-06 00:00 09:14:40.66 +05:29:02.1 HIP 45420 9.78
2026-10-06 12:00 09:14:41.39 +05:28:55.0 HIP 45420 9.62
2026-10-07 00:00 09:14:42.10 +05:28:47.9 HIP 45420 9.48
2026-10-07 12:00 09:14:42.81 +05:28:40.9 HIP 45420 9.33
2026-10-08 00:00 09:14:43.50 +05:28:33.8 HIP 45420 9.19
2026-10-08 12:00 09:14:44.18 +05:28:26.8 HIP 45420 9.06
2026-10-09 00:00 09:14:44.86 +05:28:19.8 HIP 45420 8.93
2026-10-09 12:00 09:14:45.52 +05:28:12.9 HIP 45420 8.81
2026-10-10 00:00 09:14:46.18 +05:28:06.0 HIP 45420 8.69
2026-10-10 12:00 09:14:46.82 +05:27:59.1 HIP 45420 8.58
2026-10-11 00:00 09:14:47.45 +05:27:52.2 HIP 45420 8.47