| 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) |
| 2026-09-20 00:00 |
10:08:17.65 |
+09:03:37.2 |
HIP 49562 |
24.54 |
| 2026-09-20 12:00 |
10:08:18.35 |
+09:03:33.0 |
HIP 49562 |
24.61 |
| 2026-09-21 00:00 |
10:08:19.04 |
+09:03:28.8 |
HIP 49562 |
24.69 |
| 2026-09-21 12:00 |
10:08:19.73 |
+09:03:24.6 |
HIP 49562 |
24.76 |
| 2026-09-22 00:00 |
10:08:20.41 |
+09:03:20.4 |
HIP 49562 |
24.83 |
| 2026-09-22 12:00 |
10:08:21.10 |
+09:03:16.3 |
HIP 49562 |
24.91 |
| 2026-09-23 00:00 |
10:08:21.77 |
+09:03:12.1 |
HIP 49562 |
24.98 |
| 2026-09-23 12:00 |
10:08:22.45 |
+09:03:08.0 |
HIP 49562 |
25.06 |
| 2026-09-24 00:00 |
10:08:23.12 |
+09:03:03.9 |
HIP 49562 |
25.13 |
| 2026-09-24 12:00 |
10:08:23.79 |
+09:02:59.8 |
HIP 49562 |
25.21 |
| 2026-09-25 00:00 |
10:08:24.45 |
+09:02:55.7 |
HIP 49562 |
25.29 |
| 2026-09-25 12:00 |
10:08:25.12 |
+09:02:51.6 |
HIP 49562 |
25.36 |
| 2026-09-26 00:00 |
10:08:25.77 |
+09:02:47.5 |
HIP 49562 |
25.44 |
| 2026-09-26 12:00 |
10:08:26.43 |
+09:02:43.5 |
HIP 49562 |
25.52 |
| 2026-09-27 00:00 |
10:08:27.08 |
+09:02:39.4 |
HIP 49562 |
25.60 |
| 2026-09-27 12:00 |
10:08:27.73 |
+09:02:35.4 |
HIP 49562 |
25.68 |
| 2026-09-28 00:00 |
10:08:28.37 |
+09:02:31.4 |
HIP 49562 |
25.76 |
| 2026-09-28 12:00 |
10:08:29.01 |
+09:02:27.4 |
HIP 49562 |
25.84 |
| 2026-09-29 00:00 |
10:08:29.64 |
+09:02:23.5 |
HIP 49562 |
25.92 |
| 2026-09-29 12:00 |
10:08:30.28 |
+09:02:19.5 |
HIP 49562 |
26.00 |
| 2026-09-30 00:00 |
10:08:30.90 |
+09:02:15.6 |
HIP 49562 |
26.08 |
| 2026-09-30 12:00 |
10:08:31.53 |
+09:02:11.7 |
HIP 49562 |
26.16 |
| 2026-10-01 00:00 |
10:08:32.15 |
+09:02:07.8 |
HIP 49562 |
26.25 |
| 2026-10-01 12:00 |
10:08:32.76 |
+09:02:03.9 |
HIP 49562 |
26.33 |
| 2026-10-02 00:00 |
10:08:33.38 |
+09:02:00.1 |
HIP 49562 |
26.41 |
| 2026-10-02 12:00 |
10:08:33.98 |
+09:01:56.3 |
HIP 49562 |
26.49 |
| 2026-10-03 00:00 |
10:08:34.59 |
+09:01:52.4 |
HIP 49562 |
26.57 |
| 2026-10-03 12:00 |
10:08:35.19 |
+09:01:48.6 |
HIP 49562 |
26.66 |
| 2026-10-04 00:00 |
10:08:35.78 |
+09:01:44.9 |
HIP 49562 |
26.74 |
| 2026-10-04 12:00 |
10:08:36.37 |
+09:01:41.1 |
HIP 49562 |
26.82 |
| 2026-10-05 00:00 |
10:08:36.96 |
+09:01:37.4 |
HIP 49562 |
26.90 |
| 2026-10-05 12:00 |
10:08:37.54 |
+09:01:33.7 |
HIP 49562 |
26.99 |
| 2026-10-06 00:00 |
10:08:38.12 |
+09:01:30.0 |
HIP 49562 |
27.07 |
| 2026-10-06 12:00 |
10:08:38.69 |
+09:01:26.3 |
HIP 49562 |
27.15 |
| 2026-10-07 00:00 |
10:08:39.26 |
+09:01:22.7 |
HIP 49562 |
27.23 |
| 2026-10-07 12:00 |
10:08:39.82 |
+09:01:19.0 |
HIP 49562 |
27.31 |
| 2026-10-08 00:00 |
10:08:40.38 |
+09:01:15.4 |
HIP 49562 |
27.40 |
| 2026-10-08 12:00 |
10:08:40.94 |
+09:01:11.9 |
HIP 49562 |
27.48 |
| 2026-10-09 00:00 |
10:08:41.49 |
+09:01:08.3 |
HIP 49562 |
27.56 |
| 2026-10-09 12:00 |
10:08:42.03 |
+09:01:04.8 |
HIP 49562 |
27.64 |
| 2026-10-10 00:00 |
10:08:42.57 |
+09:01:01.3 |
HIP 49562 |
27.72 |
| 2026-10-10 12:00 |
10:08:43.11 |
+09:00:57.8 |
HIP 49562 |
27.80 |
| 2026-10-11 00:00 |
10:08:43.64 |
+09:00:54.3 |
HIP 49562 |
27.88 |