| Parameter |
Value |
| Designation |
C/2009 B2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-03-07T09:25:59.010240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:28Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-03-11.0000000 |
| e |
0.94428145 |
| q (au) |
2.327612 |
| a (au) |
41.774447 |
| i (deg) |
156.872979 |
| Ω (om, deg) |
18.814641 |
| ω (w, deg) |
192.495776 |
| M (ma, deg) |
0.013167 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.370 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.370 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.916 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
02:04:53.50 |
+07:39:14.9 |
HIP 9706 |
4.93 |
| 2026-07-29 12:00 |
02:04:53.06 |
+07:39:09.3 |
HIP 9706 |
5.01 |
| 2026-07-30 00:00 |
02:04:52.60 |
+07:39:03.5 |
HIP 9706 |
5.10 |
| 2026-07-30 12:00 |
02:04:52.10 |
+07:38:57.6 |
HIP 9706 |
5.19 |
| 2026-07-31 00:00 |
02:04:51.58 |
+07:38:51.5 |
HIP 9706 |
5.28 |
| 2026-07-31 12:00 |
02:04:51.02 |
+07:38:45.3 |
HIP 9706 |
5.39 |
| 2026-08-01 00:00 |
02:04:50.44 |
+07:38:38.9 |
HIP 9706 |
5.49 |
| 2026-08-01 12:00 |
02:04:49.83 |
+07:38:32.3 |
HIP 9706 |
5.61 |
| 2026-08-02 00:00 |
02:04:49.18 |
+07:38:25.6 |
HIP 9706 |
5.73 |
| 2026-08-02 12:00 |
02:04:48.51 |
+07:38:18.7 |
HIP 9706 |
5.86 |
| 2026-08-03 00:00 |
02:04:47.81 |
+07:38:11.7 |
HIP 9706 |
6.00 |
| 2026-08-03 12:00 |
02:04:47.08 |
+07:38:04.5 |
HIP 9706 |
6.14 |
| 2026-08-04 00:00 |
02:04:46.32 |
+07:37:57.2 |
HIP 9706 |
6.29 |
| 2026-08-04 12:00 |
02:04:45.53 |
+07:37:49.7 |
HIP 9706 |
6.46 |
| 2026-08-05 00:00 |
02:04:44.71 |
+07:37:42.0 |
HIP 9706 |
6.63 |
| 2026-08-05 12:00 |
02:04:43.86 |
+07:37:34.2 |
HIP 9706 |
6.80 |
| 2026-08-06 00:00 |
02:04:42.98 |
+07:37:26.3 |
HIP 9706 |
6.99 |
| 2026-08-06 12:00 |
02:04:42.07 |
+07:37:18.2 |
HIP 9706 |
7.19 |
| 2026-08-07 00:00 |
02:04:41.13 |
+07:37:09.9 |
HIP 9706 |
7.39 |
| 2026-08-07 12:00 |
02:04:40.16 |
+07:37:01.5 |
HIP 9706 |
7.60 |
| 2026-08-08 00:00 |
02:04:39.17 |
+07:36:52.9 |
HIP 9706 |
7.83 |
| 2026-08-08 12:00 |
02:04:38.14 |
+07:36:44.2 |
HIP 9706 |
8.06 |
| 2026-08-09 00:00 |
02:04:37.08 |
+07:36:35.3 |
HIP 9706 |
8.30 |
| 2026-08-09 12:00 |
02:04:36.00 |
+07:36:26.3 |
HIP 9706 |
8.55 |
| 2026-08-10 00:00 |
02:04:34.88 |
+07:36:17.1 |
HIP 9706 |
8.81 |
| 2026-08-10 12:00 |
02:04:33.74 |
+07:36:07.8 |
HIP 9706 |
9.08 |
| 2026-08-11 00:00 |
02:04:32.56 |
+07:35:58.3 |
HIP 9706 |
9.36 |
| 2026-08-11 12:00 |
02:04:31.36 |
+07:35:48.7 |
HIP 9706 |
9.64 |
| 2026-08-12 00:00 |
02:04:30.12 |
+07:35:38.9 |
HIP 9706 |
9.94 |
| 2026-08-12 12:00 |
02:04:28.86 |
+07:35:29.0 |
HIP 9706 |
10.25 |
| 2026-08-13 00:00 |
02:04:27.57 |
+07:35:19.0 |
HIP 9706 |
10.56 |
| 2026-08-13 12:00 |
02:04:26.25 |
+07:35:08.8 |
HIP 9706 |
10.88 |
| 2026-08-14 00:00 |
02:04:24.90 |
+07:34:58.4 |
HIP 9706 |
11.22 |
| 2026-08-14 12:00 |
02:04:23.52 |
+07:34:47.9 |
HIP 9706 |
11.56 |
| 2026-08-15 00:00 |
02:04:22.11 |
+07:34:37.2 |
HIP 9706 |
11.91 |
| 2026-08-15 12:00 |
02:04:20.67 |
+07:34:26.5 |
HIP 9706 |
12.27 |
| 2026-08-16 00:00 |
02:04:19.21 |
+07:34:15.5 |
HIP 9706 |
12.64 |
| 2026-08-16 12:00 |
02:04:17.71 |
+07:34:04.4 |
HIP 9706 |
13.01 |
| 2026-08-17 00:00 |
02:04:16.19 |
+07:33:53.2 |
HIP 9706 |
13.40 |
| 2026-08-17 12:00 |
02:04:14.64 |
+07:33:41.9 |
HIP 9706 |
13.79 |
| 2026-08-18 00:00 |
02:04:13.06 |
+07:33:30.4 |
HIP 9706 |
14.19 |
| 2026-08-18 12:00 |
02:04:11.45 |
+07:33:18.7 |
HIP 9706 |
14.60 |
| 2026-08-19 00:00 |
02:04:09.81 |
+07:33:07.0 |
HIP 9706 |
15.02 |