| 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) |
| 2026-06-01 00:00 |
18:39:46.16 |
-26:49:59.1 |
HIP 91621 |
18.74 |
| 2026-06-01 12:00 |
18:39:42.39 |
-26:50:00.0 |
HIP 91621 |
19.55 |
| 2026-06-02 00:00 |
18:39:38.60 |
-26:50:01.0 |
HIP 91621 |
20.37 |
| 2026-06-02 12:00 |
18:39:34.80 |
-26:50:01.9 |
HIP 91621 |
21.19 |
| 2026-06-03 00:00 |
18:39:30.97 |
-26:50:02.8 |
HIP 91621 |
22.02 |
| 2026-06-03 12:00 |
18:39:27.14 |
-26:50:03.7 |
HIP 91621 |
22.85 |
| 2026-06-04 00:00 |
18:39:23.28 |
-26:50:04.6 |
HIP 91621 |
23.69 |
| 2026-06-04 12:00 |
18:39:19.41 |
-26:50:05.4 |
HIP 91621 |
24.53 |
| 2026-06-05 00:00 |
18:39:15.53 |
-26:50:06.3 |
HIP 91621 |
25.38 |
| 2026-06-05 12:00 |
18:39:11.63 |
-26:50:07.1 |
HIP 91621 |
26.23 |
| 2026-06-06 00:00 |
18:39:07.71 |
-26:50:07.8 |
HIP 91621 |
27.09 |
| 2026-06-06 12:00 |
18:39:03.78 |
-26:50:08.6 |
HIP 91621 |
27.95 |
| 2026-06-07 00:00 |
18:38:59.83 |
-26:50:09.4 |
HIP 91621 |
28.81 |
| 2026-06-07 12:00 |
18:38:55.87 |
-26:50:10.1 |
HIP 91621 |
29.68 |
| 2026-06-08 00:00 |
18:38:51.90 |
-26:50:10.8 |
HIP 91621 |
30.56 |
| 2026-06-08 12:00 |
18:38:47.91 |
-26:50:11.5 |
HIP 91621 |
31.43 |
| 2026-06-09 00:00 |
18:38:43.91 |
-26:50:12.1 |
HIP 91222 |
32.14 |
| 2026-06-09 12:00 |
18:38:39.89 |
-26:50:12.7 |
HIP 91222 |
31.30 |
| 2026-06-10 00:00 |
18:38:35.86 |
-26:50:13.3 |
HIP 91222 |
30.46 |
| 2026-06-10 12:00 |
18:38:31.82 |
-26:50:13.9 |
HIP 91222 |
29.63 |
| 2026-06-11 00:00 |
18:38:27.77 |
-26:50:14.5 |
HIP 91222 |
28.79 |
| 2026-06-11 12:00 |
18:38:23.70 |
-26:50:15.0 |
HIP 91222 |
27.96 |
| 2026-06-12 00:00 |
18:38:19.63 |
-26:50:15.5 |
HIP 91222 |
27.13 |
| 2026-06-12 12:00 |
18:38:15.54 |
-26:50:16.0 |
HIP 91222 |
26.30 |
| 2026-06-13 00:00 |
18:38:11.44 |
-26:50:16.4 |
HIP 91222 |
25.48 |
| 2026-06-13 12:00 |
18:38:07.33 |
-26:50:16.9 |
HIP 91222 |
24.66 |
| 2026-06-14 00:00 |
18:38:03.21 |
-26:50:17.2 |
HIP 91222 |
23.85 |
| 2026-06-14 12:00 |
18:37:59.08 |
-26:50:17.6 |
HIP 91222 |
23.04 |
| 2026-06-15 00:00 |
18:37:54.93 |
-26:50:18.0 |
HIP 91222 |
22.24 |
| 2026-06-15 12:00 |
18:37:50.78 |
-26:50:18.3 |
HIP 91222 |
21.45 |
| 2026-06-16 00:00 |
18:37:46.63 |
-26:50:18.5 |
HIP 91222 |
20.66 |
| 2026-06-16 12:00 |
18:37:42.46 |
-26:50:18.8 |
HIP 91222 |
19.89 |
| 2026-06-17 00:00 |
18:37:38.28 |
-26:50:19.0 |
HIP 91222 |
19.13 |
| 2026-06-17 12:00 |
18:37:34.10 |
-26:50:19.2 |
HIP 91222 |
18.39 |
| 2026-06-18 00:00 |
18:37:29.90 |
-26:50:19.4 |
HIP 91222 |
17.66 |
| 2026-06-18 12:00 |
18:37:25.71 |
-26:50:19.5 |
HIP 91222 |
16.95 |
| 2026-06-19 00:00 |
18:37:21.50 |
-26:50:19.6 |
HIP 91222 |
16.27 |
| 2026-06-19 12:00 |
18:37:17.29 |
-26:50:19.6 |
HIP 91222 |
15.61 |
| 2026-06-20 00:00 |
18:37:13.07 |
-26:50:19.7 |
HIP 91222 |
14.98 |
| 2026-06-20 12:00 |
18:37:08.84 |
-26:50:19.7 |
HIP 91222 |
14.38 |
| 2026-06-21 00:00 |
18:37:04.61 |
-26:50:19.6 |
HIP 91222 |
13.82 |
| 2026-06-21 12:00 |
18:37:00.37 |
-26:50:19.6 |
HIP 91222 |
13.31 |
| 2026-06-22 00:00 |
18:36:56.13 |
-26:50:19.5 |
HIP 91222 |
12.84 |