C/1900 O1 (Borrelly-Brooks)

Metadata

Parameter Value
Designation C/1900 O1 (Borrelly-Brooks)
Type C
Perihelion (tp_cal, UTC) 1900-08-03T16:49:18.926400Z
Orbit solution date (soln_date, UTC) 2023-10-09T20:36:15Z
Obs used 121
NEO -
M1 -
K1 -
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1900-08-15.0000000
e 1.00032171
q (au) 1.014834
a (au) -3154.489395
i (deg) 62.532910
Ω (om, deg) 329.412543
ω (w, deg) 12.422902
M (ma, deg) 0.000063

Magnitude

C/1900 O1 (Borrelly-Brooks) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (8.587 + 4.390\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 8.587
n 4.390
gf 0.816
gb -0.500
k 0.804
δ90 1.000
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)
2026-03-26 00:00 10:06:42.11 +09:11:23.9 HIP 49492 22.33
2026-03-26 12:00 10:06:41.45 +09:11:27.7 HIP 49492 22.34
2026-03-27 00:00 10:06:40.79 +09:11:31.5 HIP 49492 22.36
2026-03-27 12:00 10:06:40.14 +09:11:35.3 HIP 49492 22.37
2026-03-28 00:00 10:06:39.50 +09:11:39.0 HIP 49492 22.39
2026-03-28 12:00 10:06:38.86 +09:11:42.8 HIP 49492 22.41
2026-03-29 00:00 10:06:38.22 +09:11:46.5 HIP 49492 22.43
2026-03-29 12:00 10:06:37.59 +09:11:50.2 HIP 49492 22.45
2026-03-30 00:00 10:06:36.96 +09:11:53.9 HIP 49492 22.47
2026-03-30 12:00 10:06:36.34 +09:11:57.5 HIP 49492 22.49
2026-03-31 00:00 10:06:35.72 +09:12:01.2 HIP 49492 22.52
2026-03-31 12:00 10:06:35.11 +09:12:04.8 HIP 49492 22.54
2026-04-01 00:00 10:06:34.50 +09:12:08.4 HIP 49492 22.57
2026-04-01 12:00 10:06:33.89 +09:12:12.0 HIP 49492 22.60
2026-04-02 00:00 10:06:33.29 +09:12:15.5 HIP 49492 22.63
2026-04-02 12:00 10:06:32.69 +09:12:19.1 HIP 49492 22.66
2026-04-03 00:00 10:06:32.10 +09:12:22.6 HIP 49492 22.69
2026-04-03 12:00 10:06:31.52 +09:12:26.0 HIP 49492 22.72
2026-04-04 00:00 10:06:30.93 +09:12:29.5 HIP 49492 22.75
2026-04-04 12:00 10:06:30.36 +09:12:32.9 HIP 49492 22.78
2026-04-05 00:00 10:06:29.79 +09:12:36.4 HIP 49492 22.82
2026-04-05 12:00 10:06:29.22 +09:12:39.7 HIP 49492 22.85
2026-04-06 00:00 10:06:28.66 +09:12:43.1 HIP 49492 22.89
2026-04-06 12:00 10:06:28.10 +09:12:46.4 HIP 49492 22.92
2026-04-07 00:00 10:06:27.55 +09:12:49.8 HIP 49492 22.96
2026-04-07 12:00 10:06:27.00 +09:12:53.1 HIP 49492 22.99
2026-04-08 00:00 10:06:26.46 +09:12:56.3 HIP 49492 23.03
2026-04-08 12:00 10:06:25.92 +09:12:59.6 HIP 49492 23.07
2026-04-09 00:00 10:06:25.39 +09:13:02.8 HIP 49492 23.11
2026-04-09 12:00 10:06:24.86 +09:13:06.0 HIP 49492 23.15
2026-04-10 00:00 10:06:24.34 +09:13:09.1 HIP 49492 23.19
2026-04-10 12:00 10:06:23.83 +09:13:12.3 HIP 49492 23.23
2026-04-11 00:00 10:06:23.32 +09:13:15.4 HIP 49492 23.27
2026-04-11 12:00 10:06:22.81 +09:13:18.5 HIP 49492 23.31
2026-04-12 00:00 10:06:22.31 +09:13:21.5 HIP 49492 23.35
2026-04-12 12:00 10:06:21.82 +09:13:24.5 HIP 49492 23.39
2026-04-13 00:00 10:06:21.33 +09:13:27.5 HIP 49492 23.43
2026-04-13 12:00 10:06:20.84 +09:13:30.5 HIP 49492 23.48
2026-04-14 00:00 10:06:20.37 +09:13:33.5 HIP 49492 23.52
2026-04-14 12:00 10:06:19.89 +09:13:36.4 HIP 49492 23.56
2026-04-15 00:00 10:06:19.43 +09:13:39.3 HIP 49492 23.60
2026-04-15 12:00 10:06:18.97 +09:13:42.1 HIP 49492 23.65
2026-04-16 00:00 10:06:18.51 +09:13:45.0 HIP 49492 23.69