| Parameter |
Value |
| Designation |
C/2010 B1 (Cardinal) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-02-07T01:26:00.456000Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:12:44Z |
| Obs used |
2090 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
7.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-10-26.0000000 |
| e |
0.99899435 |
| q (au) |
2.941487 |
| a (au) |
2924.960222 |
| i (deg) |
101.977683 |
| Ω (om, deg) |
277.213907 |
| ω (w, deg) |
211.519913 |
| M (ma, deg) |
359.999352 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.296 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.296 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-0.978 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2010-01-19 |
2010-08-30 |
+4.8225 |
-3.111 |
| 2010-08-30 |
2011-02-06 |
-10.8522 |
+5.203 |
| 2011-02-07 |
2012-02-12 |
+3.6110 |
-1.630 |
| 2012-02-12 |
2014-03-13 |
-14.7522 |
+11.129 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:31:50.69 |
-26:48:23.4 |
HIP 90868 |
4.90 |
| 2026-07-29 12:00 |
18:31:46.97 |
-26:48:20.2 |
HIP 90868 |
5.72 |
| 2026-07-30 00:00 |
18:31:43.28 |
-26:48:17.0 |
HIP 90868 |
6.53 |
| 2026-07-30 12:00 |
18:31:39.60 |
-26:48:13.8 |
HIP 90868 |
7.35 |
| 2026-07-31 00:00 |
18:31:35.94 |
-26:48:10.5 |
HIP 90868 |
8.16 |
| 2026-07-31 12:00 |
18:31:32.30 |
-26:48:07.2 |
HIP 90868 |
8.97 |
| 2026-08-01 00:00 |
18:31:28.68 |
-26:48:03.8 |
HIP 90868 |
9.78 |
| 2026-08-01 12:00 |
18:31:25.08 |
-26:48:00.4 |
HIP 90868 |
10.58 |
| 2026-08-02 00:00 |
18:31:21.50 |
-26:47:56.9 |
HIP 90868 |
11.38 |
| 2026-08-02 12:00 |
18:31:17.94 |
-26:47:53.4 |
HIP 90868 |
12.18 |
| 2026-08-03 00:00 |
18:31:14.40 |
-26:47:49.9 |
HIP 90868 |
12.97 |
| 2026-08-03 12:00 |
18:31:10.88 |
-26:47:46.3 |
HIP 90868 |
13.75 |
| 2026-08-04 00:00 |
18:31:07.38 |
-26:47:42.7 |
HIP 90868 |
14.54 |
| 2026-08-04 12:00 |
18:31:03.90 |
-26:47:39.0 |
HIP 90868 |
15.31 |
| 2026-08-05 00:00 |
18:31:00.44 |
-26:47:35.3 |
HIP 90868 |
16.09 |
| 2026-08-05 12:00 |
18:30:57.01 |
-26:47:31.5 |
HIP 90868 |
16.86 |
| 2026-08-06 00:00 |
18:30:53.59 |
-26:47:27.7 |
HIP 90868 |
17.62 |
| 2026-08-06 12:00 |
18:30:50.20 |
-26:47:23.9 |
HIP 90868 |
18.38 |
| 2026-08-07 00:00 |
18:30:46.84 |
-26:47:20.0 |
HIP 90868 |
19.13 |
| 2026-08-07 12:00 |
18:30:43.49 |
-26:47:16.1 |
HIP 90868 |
19.88 |
| 2026-08-08 00:00 |
18:30:40.17 |
-26:47:12.2 |
HIP 90868 |
20.62 |
| 2026-08-08 12:00 |
18:30:36.87 |
-26:47:08.2 |
HIP 90868 |
21.36 |
| 2026-08-09 00:00 |
18:30:33.59 |
-26:47:04.1 |
HIP 90868 |
22.10 |
| 2026-08-09 12:00 |
18:30:30.34 |
-26:47:00.1 |
HIP 90868 |
22.83 |
| 2026-08-10 00:00 |
18:30:27.11 |
-26:46:55.9 |
HIP 90575 |
23.04 |
| 2026-08-10 12:00 |
18:30:23.91 |
-26:46:51.8 |
HIP 90575 |
22.38 |
| 2026-08-11 00:00 |
18:30:20.73 |
-26:46:47.6 |
HIP 90575 |
21.74 |
| 2026-08-11 12:00 |
18:30:17.58 |
-26:46:43.3 |
HIP 90575 |
21.10 |
| 2026-08-12 00:00 |
18:30:14.45 |
-26:46:39.0 |
HIP 90575 |
20.47 |
| 2026-08-12 12:00 |
18:30:11.34 |
-26:46:34.7 |
HIP 90575 |
19.85 |
| 2026-08-13 00:00 |
18:30:08.26 |
-26:46:30.4 |
HIP 90575 |
19.24 |
| 2026-08-13 12:00 |
18:30:05.21 |
-26:46:25.9 |
HIP 90575 |
18.64 |
| 2026-08-14 00:00 |
18:30:02.18 |
-26:46:21.5 |
HIP 90575 |
18.05 |
| 2026-08-14 12:00 |
18:29:59.18 |
-26:46:17.0 |
HIP 90575 |
17.47 |
| 2026-08-15 00:00 |
18:29:56.21 |
-26:46:12.5 |
HIP 90575 |
16.90 |
| 2026-08-15 12:00 |
18:29:53.26 |
-26:46:07.9 |
HIP 90575 |
16.34 |
| 2026-08-16 00:00 |
18:29:50.34 |
-26:46:03.3 |
HIP 90575 |
15.80 |
| 2026-08-16 12:00 |
18:29:47.45 |
-26:45:58.7 |
HIP 90575 |
15.26 |
| 2026-08-17 00:00 |
18:29:44.58 |
-26:45:54.0 |
HIP 90575 |
14.75 |
| 2026-08-17 12:00 |
18:29:41.74 |
-26:45:49.3 |
HIP 90575 |
14.24 |
| 2026-08-18 00:00 |
18:29:38.93 |
-26:45:44.5 |
HIP 90575 |
13.75 |
| 2026-08-18 12:00 |
18:29:36.15 |
-26:45:39.7 |
HIP 90575 |
13.28 |
| 2026-08-19 00:00 |
18:29:33.39 |
-26:45:34.9 |
HIP 90575 |
12.82 |