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

$$ M_a = (7.709 + 5.798\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 7.709
n 5.798
gf 1.000
gb -0.782
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 09:09:49.36 +05:50:11.0 HIP 44917 18.07
2026-05-12 12:00 09:09:49.48 +05:50:13.9 HIP 44917 18.13
2026-05-13 00:00 09:09:49.61 +05:50:16.6 HIP 44917 18.18
2026-05-13 12:00 09:09:49.76 +05:50:19.3 HIP 44917 18.24
2026-05-14 00:00 09:09:49.91 +05:50:22.0 HIP 44917 18.30
2026-05-14 12:00 09:09:50.08 +05:50:24.6 HIP 44917 18.36
2026-05-15 00:00 09:09:50.26 +05:50:27.1 HIP 44917 18.42
2026-05-15 12:00 09:09:50.45 +05:50:29.6 HIP 44917 18.48
2026-05-16 00:00 09:09:50.65 +05:50:32.0 HIP 44917 18.55
2026-05-16 12:00 09:09:50.86 +05:50:34.4 HIP 44917 18.61
2026-05-17 00:00 09:09:51.09 +05:50:36.7 HIP 44917 18.68
2026-05-17 12:00 09:09:51.32 +05:50:38.9 HIP 44917 18.74
2026-05-18 00:00 09:09:51.57 +05:50:41.1 HIP 44917 18.81
2026-05-18 12:00 09:09:51.83 +05:50:43.3 HIP 44917 18.88
2026-05-19 00:00 09:09:52.10 +05:50:45.3 HIP 44917 18.95
2026-05-19 12:00 09:09:52.38 +05:50:47.3 HIP 44917 19.02
2026-05-20 00:00 09:09:52.67 +05:50:49.3 HIP 44917 19.09
2026-05-20 12:00 09:09:52.98 +05:50:51.2 HIP 44917 19.17
2026-05-21 00:00 09:09:53.29 +05:50:53.0 HIP 44917 19.24
2026-05-21 12:00 09:09:53.62 +05:50:54.8 HIP 44917 19.32
2026-05-22 00:00 09:09:53.96 +05:50:56.5 HIP 44917 19.39
2026-05-22 12:00 09:09:54.30 +05:50:58.2 HIP 44917 19.47
2026-05-23 00:00 09:09:54.66 +05:50:59.8 HIP 44917 19.55
2026-05-23 12:00 09:09:55.03 +05:51:01.3 HIP 44917 19.63
2026-05-24 00:00 09:09:55.42 +05:51:02.8 HIP 44917 19.71
2026-05-24 12:00 09:09:55.81 +05:51:04.2 HIP 44917 19.80
2026-05-25 00:00 09:09:56.21 +05:51:05.5 HIP 44917 19.88
2026-05-25 12:00 09:09:56.63 +05:51:06.8 HIP 44917 19.97
2026-05-26 00:00 09:09:57.05 +05:51:08.1 HIP 44917 20.05
2026-05-26 12:00 09:09:57.49 +05:51:09.2 HIP 44917 20.14
2026-05-27 00:00 09:09:57.93 +05:51:10.4 HIP 44917 20.23
2026-05-27 12:00 09:09:58.39 +05:51:11.4 HIP 44917 20.32
2026-05-28 00:00 09:09:58.86 +05:51:12.4 HIP 44917 20.42
2026-05-28 12:00 09:09:59.34 +05:51:13.3 HIP 44917 20.51
2026-05-29 00:00 09:09:59.83 +05:51:14.2 HIP 44917 20.60
2026-05-29 12:00 09:10:00.33 +05:51:15.0 HIP 44917 20.70
2026-05-30 00:00 09:10:00.84 +05:51:15.8 HIP 44917 20.80
2026-05-30 12:00 09:10:01.36 +05:51:16.5 HIP 44917 20.90
2026-05-31 00:00 09:10:01.89 +05:51:17.1 HIP 44917 21.00
2026-05-31 12:00 09:10:02.43 +05:51:17.7 HIP 44917 21.10
2026-06-01 00:00 09:10:02.98 +05:51:18.2 HIP 44917 21.20
2026-06-01 12:00 09:10:03.54 +05:51:18.6 HIP 44917 21.31
2026-06-02 00:00 09:10:04.11 +05:51:19.0 HIP 44917 21.42