| 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
$$
M_a = (16.433 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.433 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
9.991 |
| 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) |
| 2026-03-26 00:00 |
04:31:58.88 |
+11:48:07.5 |
HIP 21194 |
26.79 |
| 2026-03-26 12:00 |
04:32:00.50 |
+11:48:15.2 |
HIP 21194 |
26.52 |
| 2026-03-27 00:00 |
04:32:02.15 |
+11:48:23.1 |
HIP 21194 |
26.26 |
| 2026-03-27 12:00 |
04:32:03.83 |
+11:48:30.9 |
HIP 21194 |
26.00 |
| 2026-03-28 00:00 |
04:32:05.53 |
+11:48:38.8 |
HIP 21194 |
25.74 |
| 2026-03-28 12:00 |
04:32:07.27 |
+11:48:46.7 |
HIP 21194 |
25.48 |
| 2026-03-29 00:00 |
04:32:09.03 |
+11:48:54.5 |
HIP 21194 |
25.22 |
| 2026-03-29 12:00 |
04:32:10.82 |
+11:49:02.5 |
HIP 21194 |
24.97 |
| 2026-03-30 00:00 |
04:32:12.64 |
+11:49:10.4 |
HIP 21194 |
24.72 |
| 2026-03-30 12:00 |
04:32:14.49 |
+11:49:18.3 |
HIP 21194 |
24.48 |
| 2026-03-31 00:00 |
04:32:16.37 |
+11:49:26.3 |
HIP 21194 |
24.24 |
| 2026-03-31 12:00 |
04:32:18.27 |
+11:49:34.3 |
HIP 21194 |
24.00 |
| 2026-04-01 00:00 |
04:32:20.20 |
+11:49:42.3 |
HIP 21194 |
23.77 |
| 2026-04-01 12:00 |
04:32:22.16 |
+11:49:50.3 |
HIP 21194 |
23.55 |
| 2026-04-02 00:00 |
04:32:24.15 |
+11:49:58.3 |
HIP 21194 |
23.34 |
| 2026-04-02 12:00 |
04:32:26.16 |
+11:50:06.3 |
HIP 21194 |
23.13 |
| 2026-04-03 00:00 |
04:32:28.20 |
+11:50:14.3 |
HIP 21194 |
22.93 |
| 2026-04-03 12:00 |
04:32:30.27 |
+11:50:22.3 |
HIP 21194 |
22.75 |
| 2026-04-04 00:00 |
04:32:32.37 |
+11:50:30.4 |
HIP 21194 |
22.57 |
| 2026-04-04 12:00 |
04:32:34.49 |
+11:50:38.4 |
HIP 21194 |
22.40 |
| 2026-04-05 00:00 |
04:32:36.64 |
+11:50:46.5 |
HIP 21194 |
22.24 |
| 2026-04-05 12:00 |
04:32:38.81 |
+11:50:54.5 |
HIP 21194 |
22.10 |
| 2026-04-06 00:00 |
04:32:41.01 |
+11:51:02.6 |
HIP 21194 |
21.97 |
| 2026-04-06 12:00 |
04:32:43.24 |
+11:51:10.6 |
HIP 21194 |
21.85 |
| 2026-04-07 00:00 |
04:32:45.49 |
+11:51:18.7 |
HIP 21194 |
21.74 |
| 2026-04-07 12:00 |
04:32:47.76 |
+11:51:26.8 |
HIP 21194 |
21.66 |
| 2026-04-08 00:00 |
04:32:50.07 |
+11:51:34.8 |
HIP 21194 |
21.58 |
| 2026-04-08 12:00 |
04:32:52.39 |
+11:51:42.9 |
HIP 21194 |
21.52 |
| 2026-04-09 00:00 |
04:32:54.75 |
+11:51:50.9 |
HIP 21194 |
21.48 |
| 2026-04-09 12:00 |
04:32:57.12 |
+11:51:59.0 |
HIP 21194 |
21.46 |
| 2026-04-10 00:00 |
04:32:59.52 |
+11:52:07.1 |
HIP 21194 |
21.46 |
| 2026-04-10 12:00 |
04:33:01.95 |
+11:52:15.1 |
HIP 21194 |
21.47 |
| 2026-04-11 00:00 |
04:33:04.40 |
+11:52:23.1 |
HIP 21194 |
21.50 |
| 2026-04-11 12:00 |
04:33:06.87 |
+11:52:31.2 |
HIP 21194 |
21.55 |
| 2026-04-12 00:00 |
04:33:09.37 |
+11:52:39.2 |
HIP 21194 |
21.63 |
| 2026-04-12 12:00 |
04:33:11.89 |
+11:52:47.2 |
HIP 21194 |
21.72 |
| 2026-04-13 00:00 |
04:33:14.44 |
+11:52:55.2 |
HIP 21194 |
21.83 |
| 2026-04-13 12:00 |
04:33:17.01 |
+11:53:03.2 |
HIP 21194 |
21.96 |
| 2026-04-14 00:00 |
04:33:19.60 |
+11:53:11.2 |
HIP 21194 |
22.11 |
| 2026-04-14 12:00 |
04:33:22.21 |
+11:53:19.1 |
HIP 21194 |
22.29 |
| 2026-04-15 00:00 |
04:33:24.85 |
+11:53:27.1 |
HIP 21194 |
22.48 |
| 2026-04-15 12:00 |
04:33:27.51 |
+11:53:35.0 |
HIP 21194 |
22.70 |
| 2026-04-16 00:00 |
04:33:30.19 |
+11:53:43.0 |
HIP 21194 |
22.93 |