| Parameter |
Value |
| Designation |
C/2005 B1 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-23T13:43:37.490880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:46Z |
| Obs used |
1486 |
| NEO |
- |
| M1 |
11.500 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-01-10.0000000 |
| e |
1.00019141 |
| q (au) |
3.204932 |
| a (au) |
-16744.183157 |
| i (deg) |
92.551160 |
| Ω (om, deg) |
195.556048 |
| ω (w, deg) |
103.182514 |
| M (ma, deg) |
-0.000020 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.992 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.992 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.502 |
| 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 |
| 2004-03-18 |
2006-02-03 |
+3.8130 |
-2.553 |
| 2006-03-02 |
2007-11-03 |
+0.9425 |
-0.298 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:33:09.32 |
-57:53:30.4 |
HIP 16722 |
16.52 |
| 2026-09-20 12:00 |
03:33:06.59 |
-57:54:11.2 |
HIP 16443 |
15.82 |
| 2026-09-21 00:00 |
03:33:03.81 |
-57:54:51.8 |
HIP 16443 |
15.07 |
| 2026-09-21 12:00 |
03:33:00.99 |
-57:55:32.2 |
HIP 16443 |
14.32 |
| 2026-09-22 00:00 |
03:32:58.13 |
-57:56:12.5 |
HIP 16443 |
13.57 |
| 2026-09-22 12:00 |
03:32:55.23 |
-57:56:52.5 |
HIP 16443 |
12.82 |
| 2026-09-23 00:00 |
03:32:52.29 |
-57:57:32.4 |
HIP 16443 |
12.08 |
| 2026-09-23 12:00 |
03:32:49.31 |
-57:58:12.0 |
HIP 16443 |
11.34 |
| 2026-09-24 00:00 |
03:32:46.28 |
-57:58:51.5 |
HIP 16443 |
10.59 |
| 2026-09-24 12:00 |
03:32:43.22 |
-57:59:30.7 |
HIP 16443 |
9.86 |
| 2026-09-25 00:00 |
03:32:40.12 |
-58:00:09.7 |
HIP 16443 |
9.12 |
| 2026-09-25 12:00 |
03:32:36.97 |
-58:00:48.5 |
HIP 16443 |
8.39 |
| 2026-09-26 00:00 |
03:32:33.79 |
-58:01:27.1 |
HIP 16443 |
7.67 |
| 2026-09-26 12:00 |
03:32:30.57 |
-58:02:05.5 |
HIP 16443 |
6.95 |
| 2026-09-27 00:00 |
03:32:27.30 |
-58:02:43.6 |
HIP 16443 |
6.24 |
| 2026-09-27 12:00 |
03:32:24.00 |
-58:03:21.6 |
HIP 16443 |
5.55 |
| 2026-09-28 00:00 |
03:32:20.66 |
-58:03:59.3 |
HIP 16443 |
4.87 |
| 2026-09-28 12:00 |
03:32:17.29 |
-58:04:36.7 |
HIP 16443 |
4.23 |
| 2026-09-29 00:00 |
03:32:13.87 |
-58:05:13.9 |
HIP 16443 |
3.63 |
| 2026-09-29 12:00 |
03:32:10.41 |
-58:05:50.9 |
HIP 16443 |
3.10 |
| 2026-09-30 00:00 |
03:32:06.92 |
-58:06:27.7 |
HIP 16443 |
2.67 |
| 2026-09-30 12:00 |
03:32:03.39 |
-58:07:04.2 |
HIP 16443 |
2.42 |
| 2026-10-01 00:00 |
03:31:59.82 |
-58:07:40.5 |
HIP 16443 |
2.39 |
| 2026-10-01 12:00 |
03:31:56.22 |
-58:08:16.5 |
HIP 16443 |
2.60 |
| 2026-10-02 00:00 |
03:31:52.58 |
-58:08:52.2 |
HIP 16443 |
2.98 |
| 2026-10-02 12:00 |
03:31:48.90 |
-58:09:27.8 |
HIP 16443 |
3.49 |
| 2026-10-03 00:00 |
03:31:45.18 |
-58:10:03.0 |
HIP 16443 |
4.08 |
| 2026-10-03 12:00 |
03:31:41.43 |
-58:10:38.0 |
HIP 16443 |
4.71 |
| 2026-10-04 00:00 |
03:31:37.64 |
-58:11:12.7 |
HIP 16443 |
5.38 |
| 2026-10-04 12:00 |
03:31:33.82 |
-58:11:47.2 |
HIP 16443 |
6.06 |
| 2026-10-05 00:00 |
03:31:29.96 |
-58:12:21.4 |
HIP 16443 |
6.76 |
| 2026-10-05 12:00 |
03:31:26.06 |
-58:12:55.3 |
HIP 16443 |
7.47 |
| 2026-10-06 00:00 |
03:31:22.14 |
-58:13:29.0 |
HIP 16443 |
8.19 |
| 2026-10-06 12:00 |
03:31:18.17 |
-58:14:02.4 |
HIP 16443 |
8.91 |
| 2026-10-07 00:00 |
03:31:14.17 |
-58:14:35.5 |
HIP 16439 |
9.44 |
| 2026-10-07 12:00 |
03:31:10.14 |
-58:15:08.3 |
HIP 16439 |
9.17 |
| 2026-10-08 00:00 |
03:31:06.08 |
-58:15:40.8 |
HIP 16439 |
8.96 |
| 2026-10-08 12:00 |
03:31:01.98 |
-58:16:13.1 |
HIP 16439 |
8.81 |
| 2026-10-09 00:00 |
03:30:57.84 |
-58:16:45.0 |
HIP 16439 |
8.74 |
| 2026-10-09 12:00 |
03:30:53.68 |
-58:17:16.7 |
HIP 16439 |
8.74 |
| 2026-10-10 00:00 |
03:30:49.48 |
-58:17:48.0 |
HIP 16439 |
8.81 |
| 2026-10-10 12:00 |
03:30:45.25 |
-58:18:19.1 |
HIP 16439 |
8.95 |
| 2026-10-11 00:00 |
03:30:40.99 |
-58:18:49.8 |
HIP 16439 |
9.16 |