| 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
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 |