| Parameter |
Value |
| Designation |
C/2012 B3 (La Sagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-12-06T20:01:59.358720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:00Z |
| Obs used |
295 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-04-01.0000000 |
| e |
1.00118336 |
| q (au) |
3.536536 |
| a (au) |
-2988.542542 |
| i (deg) |
106.932915 |
| Ω (om, deg) |
252.999494 |
| ω (w, deg) |
50.733261 |
| M (ma, deg) |
0.000701 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.434 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.434 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
04:45:59.37 |
+11:33:15.0 |
HIP 22157 |
9.10 |
| 2026-09-20 12:00 |
04:45:58.27 |
+11:32:57.6 |
HIP 22157 |
9.41 |
| 2026-09-21 00:00 |
04:45:57.14 |
+11:32:40.2 |
HIP 22157 |
9.73 |
| 2026-09-21 12:00 |
04:45:55.98 |
+11:32:22.8 |
HIP 22157 |
10.06 |
| 2026-09-22 00:00 |
04:45:54.79 |
+11:32:05.3 |
HIP 22157 |
10.39 |
| 2026-09-22 12:00 |
04:45:53.56 |
+11:31:47.7 |
HIP 22157 |
10.73 |
| 2026-09-23 00:00 |
04:45:52.30 |
+11:31:30.2 |
HIP 22157 |
11.08 |
| 2026-09-23 12:00 |
04:45:51.01 |
+11:31:12.5 |
HIP 22157 |
11.43 |
| 2026-09-24 00:00 |
04:45:49.69 |
+11:30:54.9 |
HIP 22157 |
11.79 |
| 2026-09-24 12:00 |
04:45:48.33 |
+11:30:37.2 |
HIP 22157 |
12.17 |
| 2026-09-25 00:00 |
04:45:46.94 |
+11:30:19.5 |
HIP 22157 |
12.54 |
| 2026-09-25 12:00 |
04:45:45.52 |
+11:30:01.7 |
HIP 22157 |
12.93 |
| 2026-09-26 00:00 |
04:45:44.07 |
+11:29:43.9 |
HIP 22157 |
13.32 |
| 2026-09-26 12:00 |
04:45:42.58 |
+11:29:26.1 |
HIP 22157 |
13.72 |
| 2026-09-27 00:00 |
04:45:41.07 |
+11:29:08.3 |
HIP 22157 |
14.13 |
| 2026-09-27 12:00 |
04:45:39.52 |
+11:28:50.4 |
HIP 22157 |
14.55 |
| 2026-09-28 00:00 |
04:45:37.94 |
+11:28:32.4 |
HIP 22157 |
14.97 |
| 2026-09-28 12:00 |
04:45:36.32 |
+11:28:14.5 |
HIP 22157 |
15.40 |
| 2026-09-29 00:00 |
04:45:34.68 |
+11:27:56.5 |
HIP 22157 |
15.84 |
| 2026-09-29 12:00 |
04:45:33.00 |
+11:27:38.5 |
HIP 22157 |
16.29 |
| 2026-09-30 00:00 |
04:45:31.30 |
+11:27:20.5 |
HIP 22157 |
16.74 |
| 2026-09-30 12:00 |
04:45:29.56 |
+11:27:02.4 |
HIP 22157 |
17.20 |
| 2026-10-01 00:00 |
04:45:27.79 |
+11:26:44.3 |
HIP 22157 |
17.67 |
| 2026-10-01 12:00 |
04:45:25.99 |
+11:26:26.2 |
HIP 22157 |
18.15 |
| 2026-10-02 00:00 |
04:45:24.15 |
+11:26:08.0 |
HIP 22157 |
18.63 |
| 2026-10-02 12:00 |
04:45:22.29 |
+11:25:49.9 |
HIP 22157 |
19.12 |
| 2026-10-03 00:00 |
04:45:20.39 |
+11:25:31.7 |
HIP 22157 |
19.62 |
| 2026-10-03 12:00 |
04:45:18.47 |
+11:25:13.5 |
HIP 22157 |
20.12 |
| 2026-10-04 00:00 |
04:45:16.51 |
+11:24:55.2 |
HIP 22044 |
20.39 |
| 2026-10-04 12:00 |
04:45:14.52 |
+11:24:37.0 |
HIP 22044 |
19.85 |
| 2026-10-05 00:00 |
04:45:12.51 |
+11:24:18.7 |
HIP 22044 |
19.31 |
| 2026-10-05 12:00 |
04:45:10.46 |
+11:24:00.4 |
HIP 22044 |
18.77 |
| 2026-10-06 00:00 |
04:45:08.38 |
+11:23:42.1 |
HIP 22044 |
18.22 |
| 2026-10-06 12:00 |
04:45:06.27 |
+11:23:23.8 |
HIP 22044 |
17.68 |
| 2026-10-07 00:00 |
04:45:04.13 |
+11:23:05.5 |
HIP 22044 |
17.13 |
| 2026-10-07 12:00 |
04:45:01.96 |
+11:22:47.1 |
HIP 22044 |
16.59 |
| 2026-10-08 00:00 |
04:44:59.76 |
+11:22:28.8 |
HIP 22044 |
16.04 |
| 2026-10-08 12:00 |
04:44:57.53 |
+11:22:10.4 |
HIP 22044 |
15.50 |
| 2026-10-09 00:00 |
04:44:55.27 |
+11:21:52.0 |
HIP 22044 |
14.96 |
| 2026-10-09 12:00 |
04:44:52.98 |
+11:21:33.6 |
HIP 22044 |
14.43 |
| 2026-10-10 00:00 |
04:44:50.66 |
+11:21:15.2 |
HIP 22044 |
13.90 |
| 2026-10-10 12:00 |
04:44:48.31 |
+11:20:56.8 |
HIP 22044 |
13.37 |
| 2026-10-11 00:00 |
04:44:45.94 |
+11:20:38.4 |
HIP 22044 |
12.86 |