| 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) |
| 2026-06-01 00:00 |
03:26:16.34 |
-55:38:54.8 |
HIP 16055 |
11.60 |
| 2026-06-01 12:00 |
03:26:21.49 |
-55:39:06.3 |
HIP 16055 |
11.55 |
| 2026-06-02 00:00 |
03:26:26.63 |
-55:39:18.2 |
HIP 16055 |
11.56 |
| 2026-06-02 12:00 |
03:26:31.76 |
-55:39:30.4 |
HIP 16055 |
11.61 |
| 2026-06-03 00:00 |
03:26:36.88 |
-55:39:43.0 |
HIP 16055 |
11.73 |
| 2026-06-03 12:00 |
03:26:41.99 |
-55:39:55.9 |
HIP 16055 |
11.89 |
| 2026-06-04 00:00 |
03:26:47.08 |
-55:40:09.2 |
HIP 16055 |
12.10 |
| 2026-06-04 12:00 |
03:26:52.16 |
-55:40:22.7 |
HIP 16055 |
12.37 |
| 2026-06-05 00:00 |
03:26:57.23 |
-55:40:36.7 |
HIP 16055 |
12.68 |
| 2026-06-05 12:00 |
03:27:02.29 |
-55:40:50.9 |
HIP 16055 |
13.02 |
| 2026-06-06 00:00 |
03:27:07.33 |
-55:41:05.5 |
HIP 16055 |
13.41 |
| 2026-06-06 12:00 |
03:27:12.35 |
-55:41:20.5 |
HIP 16055 |
13.83 |
| 2026-06-07 00:00 |
03:27:17.37 |
-55:41:35.8 |
HIP 16055 |
14.29 |
| 2026-06-07 12:00 |
03:27:22.36 |
-55:41:51.4 |
HIP 16055 |
14.77 |
| 2026-06-08 00:00 |
03:27:27.35 |
-55:42:07.4 |
HIP 16055 |
15.28 |
| 2026-06-08 12:00 |
03:27:32.31 |
-55:42:23.7 |
HIP 16055 |
15.81 |
| 2026-06-09 00:00 |
03:27:37.27 |
-55:42:40.3 |
HIP 16055 |
16.37 |
| 2026-06-09 12:00 |
03:27:42.20 |
-55:42:57.3 |
HIP 16055 |
16.94 |
| 2026-06-10 00:00 |
03:27:47.12 |
-55:43:14.6 |
HIP 16055 |
17.53 |
| 2026-06-10 12:00 |
03:27:52.03 |
-55:43:32.2 |
HIP 16055 |
18.14 |
| 2026-06-11 00:00 |
03:27:56.91 |
-55:43:50.2 |
HIP 16055 |
18.76 |
| 2026-06-11 12:00 |
03:28:01.78 |
-55:44:08.5 |
HIP 16284 |
18.73 |
| 2026-06-12 00:00 |
03:28:06.64 |
-55:44:27.1 |
HIP 16284 |
17.99 |
| 2026-06-12 12:00 |
03:28:11.47 |
-55:44:46.0 |
HIP 16284 |
17.24 |
| 2026-06-13 00:00 |
03:28:16.29 |
-55:45:05.3 |
HIP 16284 |
16.50 |
| 2026-06-13 12:00 |
03:28:21.09 |
-55:45:25.0 |
HIP 16284 |
15.76 |
| 2026-06-14 00:00 |
03:28:25.87 |
-55:45:44.9 |
HIP 16284 |
15.01 |
| 2026-06-14 12:00 |
03:28:30.63 |
-55:46:05.2 |
HIP 16284 |
14.27 |
| 2026-06-15 00:00 |
03:28:35.37 |
-55:46:25.8 |
HIP 16284 |
13.52 |
| 2026-06-15 12:00 |
03:28:40.09 |
-55:46:46.7 |
HIP 16284 |
12.78 |
| 2026-06-16 00:00 |
03:28:44.79 |
-55:47:07.9 |
HIP 16284 |
12.03 |
| 2026-06-16 12:00 |
03:28:49.48 |
-55:47:29.5 |
HIP 16284 |
11.29 |
| 2026-06-17 00:00 |
03:28:54.14 |
-55:47:51.4 |
HIP 16284 |
10.54 |
| 2026-06-17 12:00 |
03:28:58.78 |
-55:48:13.6 |
HIP 16284 |
9.80 |
| 2026-06-18 00:00 |
03:29:03.40 |
-55:48:36.1 |
HIP 16284 |
9.05 |
| 2026-06-18 12:00 |
03:29:07.99 |
-55:48:58.9 |
HIP 16284 |
8.31 |
| 2026-06-19 00:00 |
03:29:12.57 |
-55:49:22.1 |
HIP 16284 |
7.56 |
| 2026-06-19 12:00 |
03:29:17.12 |
-55:49:45.5 |
HIP 16284 |
6.82 |
| 2026-06-20 00:00 |
03:29:21.65 |
-55:50:09.3 |
HIP 16284 |
6.08 |
| 2026-06-20 12:00 |
03:29:26.16 |
-55:50:33.4 |
HIP 16284 |
5.33 |
| 2026-06-21 00:00 |
03:29:30.65 |
-55:50:57.8 |
HIP 16284 |
4.59 |
| 2026-06-21 12:00 |
03:29:35.11 |
-55:51:22.5 |
HIP 16284 |
3.85 |
| 2026-06-22 00:00 |
03:29:39.55 |
-55:51:47.4 |
HIP 16284 |
3.12 |