| 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) |
| 2026-06-01 00:00 |
04:38:40.81 |
+12:02:46.8 |
HIP 21650 |
4.75 |
| 2026-06-01 12:00 |
04:38:44.53 |
+12:02:49.7 |
HIP 21650 |
4.11 |
| 2026-06-02 00:00 |
04:38:48.26 |
+12:02:52.4 |
HIP 21650 |
3.59 |
| 2026-06-02 12:00 |
04:38:51.98 |
+12:02:55.1 |
HIP 21650 |
3.24 |
| 2026-06-03 00:00 |
04:38:55.70 |
+12:02:57.6 |
HIP 21650 |
3.12 |
| 2026-06-03 12:00 |
04:38:59.42 |
+12:03:00.1 |
HIP 21650 |
3.27 |
| 2026-06-04 00:00 |
04:39:03.14 |
+12:03:02.5 |
HIP 21650 |
3.64 |
| 2026-06-04 12:00 |
04:39:06.86 |
+12:03:04.8 |
HIP 21650 |
4.18 |
| 2026-06-05 00:00 |
04:39:10.58 |
+12:03:07.1 |
HIP 21650 |
4.83 |
| 2026-06-05 12:00 |
04:39:14.30 |
+12:03:09.2 |
HIP 21650 |
5.55 |
| 2026-06-06 00:00 |
04:39:18.01 |
+12:03:11.2 |
HIP 21650 |
6.32 |
| 2026-06-06 12:00 |
04:39:21.72 |
+12:03:13.2 |
HIP 21650 |
7.12 |
| 2026-06-07 00:00 |
04:39:25.43 |
+12:03:15.1 |
HIP 21650 |
7.95 |
| 2026-06-07 12:00 |
04:39:29.14 |
+12:03:16.8 |
HIP 21650 |
8.79 |
| 2026-06-08 00:00 |
04:39:32.84 |
+12:03:18.5 |
HIP 21650 |
9.64 |
| 2026-06-08 12:00 |
04:39:36.54 |
+12:03:20.1 |
HIP 21650 |
10.49 |
| 2026-06-09 00:00 |
04:39:40.24 |
+12:03:21.6 |
HIP 21735 |
10.21 |
| 2026-06-09 12:00 |
04:39:43.93 |
+12:03:23.0 |
HIP 21735 |
9.72 |
| 2026-06-10 00:00 |
04:39:47.62 |
+12:03:24.3 |
HIP 21735 |
9.29 |
| 2026-06-10 12:00 |
04:39:51.31 |
+12:03:25.6 |
HIP 21735 |
8.94 |
| 2026-06-11 00:00 |
04:39:54.99 |
+12:03:26.7 |
HIP 21735 |
8.66 |
| 2026-06-11 12:00 |
04:39:58.67 |
+12:03:27.7 |
HIP 21735 |
8.48 |
| 2026-06-12 00:00 |
04:40:02.34 |
+12:03:28.7 |
HIP 21735 |
8.38 |
| 2026-06-12 12:00 |
04:40:06.01 |
+12:03:29.5 |
HIP 21735 |
8.39 |
| 2026-06-13 00:00 |
04:40:09.67 |
+12:03:30.2 |
HIP 21735 |
8.49 |
| 2026-06-13 12:00 |
04:40:13.32 |
+12:03:30.9 |
HIP 21735 |
8.69 |
| 2026-06-14 00:00 |
04:40:16.97 |
+12:03:31.5 |
HIP 21735 |
8.97 |
| 2026-06-14 12:00 |
04:40:20.62 |
+12:03:31.9 |
HIP 21735 |
9.33 |
| 2026-06-15 00:00 |
04:40:24.26 |
+12:03:32.3 |
HIP 21735 |
9.76 |
| 2026-06-15 12:00 |
04:40:27.89 |
+12:03:32.5 |
HIP 21735 |
10.24 |
| 2026-06-16 00:00 |
04:40:31.51 |
+12:03:32.7 |
HIP 21735 |
10.78 |
| 2026-06-16 12:00 |
04:40:35.13 |
+12:03:32.8 |
HIP 21735 |
11.37 |
| 2026-06-17 00:00 |
04:40:38.74 |
+12:03:32.7 |
HIP 21735 |
11.98 |
| 2026-06-17 12:00 |
04:40:42.34 |
+12:03:32.6 |
HIP 21735 |
12.63 |
| 2026-06-18 00:00 |
04:40:45.93 |
+12:03:32.3 |
HIP 21735 |
13.31 |
| 2026-06-18 12:00 |
04:40:49.52 |
+12:03:32.0 |
HIP 21735 |
14.01 |
| 2026-06-19 00:00 |
04:40:53.09 |
+12:03:31.6 |
HIP 21735 |
14.73 |
| 2026-06-19 12:00 |
04:40:56.66 |
+12:03:31.0 |
HIP 21735 |
15.46 |
| 2026-06-20 00:00 |
04:41:00.22 |
+12:03:30.4 |
HIP 21735 |
16.20 |
| 2026-06-20 12:00 |
04:41:03.77 |
+12:03:29.7 |
HIP 21735 |
16.96 |
| 2026-06-21 00:00 |
04:41:07.31 |
+12:03:28.8 |
HIP 21735 |
17.72 |
| 2026-06-21 12:00 |
04:41:10.84 |
+12:03:27.9 |
HIP 21866 |
18.01 |
| 2026-06-22 00:00 |
04:41:14.36 |
+12:03:26.9 |
HIP 21866 |
17.37 |