| 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
$$
M_a = (8.588 + 4.399\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.588 |
| n |
4.399 |
| gf |
0.801 |
| gb |
-0.500 |
| k |
0.801 |
| 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) |
| 2026-06-01 00:00 |
10:06:03.68 |
+09:15:42.0 |
HIP 49492 |
25.79 |
| 2026-06-01 12:00 |
10:06:03.82 |
+09:15:41.6 |
HIP 49492 |
25.78 |
| 2026-06-02 00:00 |
10:06:03.97 |
+09:15:41.2 |
HIP 49492 |
25.77 |
| 2026-06-02 12:00 |
10:06:04.13 |
+09:15:40.7 |
HIP 49492 |
25.75 |
| 2026-06-03 00:00 |
10:06:04.29 |
+09:15:40.2 |
HIP 49492 |
25.74 |
| 2026-06-03 12:00 |
10:06:04.47 |
+09:15:39.6 |
HIP 49492 |
25.73 |
| 2026-06-04 00:00 |
10:06:04.64 |
+09:15:39.1 |
HIP 49492 |
25.71 |
| 2026-06-04 12:00 |
10:06:04.82 |
+09:15:38.4 |
HIP 49492 |
25.70 |
| 2026-06-05 00:00 |
10:06:05.01 |
+09:15:37.8 |
HIP 49492 |
25.68 |
| 2026-06-05 12:00 |
10:06:05.21 |
+09:15:37.1 |
HIP 49492 |
25.67 |
| 2026-06-06 00:00 |
10:06:05.41 |
+09:15:36.4 |
HIP 49492 |
25.65 |
| 2026-06-06 12:00 |
10:06:05.62 |
+09:15:35.6 |
HIP 49492 |
25.63 |
| 2026-06-07 00:00 |
10:06:05.84 |
+09:15:34.8 |
HIP 49492 |
25.61 |
| 2026-06-07 12:00 |
10:06:06.06 |
+09:15:33.9 |
HIP 49492 |
25.60 |
| 2026-06-08 00:00 |
10:06:06.29 |
+09:15:33.1 |
HIP 49492 |
25.58 |
| 2026-06-08 12:00 |
10:06:06.52 |
+09:15:32.2 |
HIP 49492 |
25.56 |
| 2026-06-09 00:00 |
10:06:06.76 |
+09:15:31.2 |
HIP 49492 |
25.54 |
| 2026-06-09 12:00 |
10:06:07.01 |
+09:15:30.2 |
HIP 49492 |
25.51 |
| 2026-06-10 00:00 |
10:06:07.26 |
+09:15:29.2 |
HIP 49492 |
25.49 |
| 2026-06-10 12:00 |
10:06:07.52 |
+09:15:28.1 |
HIP 49492 |
25.47 |
| 2026-06-11 00:00 |
10:06:07.78 |
+09:15:27.0 |
HIP 49492 |
25.45 |
| 2026-06-11 12:00 |
10:06:08.05 |
+09:15:25.9 |
HIP 49492 |
25.42 |
| 2026-06-12 00:00 |
10:06:08.33 |
+09:15:24.8 |
HIP 49492 |
25.40 |
| 2026-06-12 12:00 |
10:06:08.62 |
+09:15:23.6 |
HIP 49492 |
25.37 |
| 2026-06-13 00:00 |
10:06:08.90 |
+09:15:22.3 |
HIP 49492 |
25.35 |
| 2026-06-13 12:00 |
10:06:09.20 |
+09:15:21.0 |
HIP 49492 |
25.32 |
| 2026-06-14 00:00 |
10:06:09.50 |
+09:15:19.7 |
HIP 49492 |
25.30 |
| 2026-06-14 12:00 |
10:06:09.81 |
+09:15:18.4 |
HIP 49492 |
25.27 |
| 2026-06-15 00:00 |
10:06:10.13 |
+09:15:17.0 |
HIP 49492 |
25.24 |
| 2026-06-15 12:00 |
10:06:10.45 |
+09:15:15.6 |
HIP 49492 |
25.22 |
| 2026-06-16 00:00 |
10:06:10.77 |
+09:15:14.2 |
HIP 49492 |
25.19 |
| 2026-06-16 12:00 |
10:06:11.10 |
+09:15:12.7 |
HIP 49492 |
25.16 |
| 2026-06-17 00:00 |
10:06:11.44 |
+09:15:11.2 |
HIP 49492 |
25.13 |
| 2026-06-17 12:00 |
10:06:11.79 |
+09:15:09.6 |
HIP 49492 |
25.10 |
| 2026-06-18 00:00 |
10:06:12.14 |
+09:15:08.0 |
HIP 49492 |
25.07 |
| 2026-06-18 12:00 |
10:06:12.49 |
+09:15:06.4 |
HIP 49492 |
25.04 |
| 2026-06-19 00:00 |
10:06:12.85 |
+09:15:04.7 |
HIP 49492 |
25.01 |
| 2026-06-19 12:00 |
10:06:13.22 |
+09:15:03.0 |
HIP 49492 |
24.98 |
| 2026-06-20 00:00 |
10:06:13.59 |
+09:15:01.3 |
HIP 49492 |
24.95 |
| 2026-06-20 12:00 |
10:06:13.97 |
+09:14:59.6 |
HIP 49492 |
24.92 |
| 2026-06-21 00:00 |
10:06:14.36 |
+09:14:57.8 |
HIP 49492 |
24.89 |
| 2026-06-21 12:00 |
10:06:14.75 |
+09:14:55.9 |
HIP 49492 |
24.86 |
| 2026-06-22 00:00 |
10:06:15.14 |
+09:14:54.1 |
HIP 49492 |
24.83 |