C/2013 B2 (Catalina)
| Parameter |
Value |
| Designation |
C/2013 B2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-07-01T12:27:38.249280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:30Z |
| Obs used |
136 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
5.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-16.0000000 |
| e |
1.00270297 |
| q (au) |
3.734135 |
| a (au) |
-1381.494777 |
| i (deg) |
43.454890 |
| Ω (om, deg) |
331.958789 |
| ω (w, deg) |
156.433585 |
| M (ma, deg) |
-0.000893 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.637 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.637 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-02-03 00:00 |
18:25:55.78 |
-61:43:05.1 |
HIP 90387 |
5.83 |
| 2026-02-03 12:00 |
18:26:03.77 |
-61:43:25.5 |
HIP 90387 |
5.34 |
| 2026-02-04 00:00 |
18:26:11.71 |
-61:43:46.1 |
HIP 90387 |
5.01 |
| 2026-02-04 12:00 |
18:26:19.61 |
-61:44:07.0 |
HIP 90387 |
4.87 |
| 2026-02-05 00:00 |
18:26:27.46 |
-61:44:28.2 |
HIP 90387 |
4.94 |
| 2026-02-05 12:00 |
18:26:35.26 |
-61:44:49.6 |
HIP 90387 |
5.20 |
| 2026-02-06 00:00 |
18:26:43.02 |
-61:45:11.3 |
HIP 90387 |
5.64 |
| 2026-02-06 12:00 |
18:26:50.73 |
-61:45:33.2 |
HIP 90387 |
6.20 |
| 2026-02-07 00:00 |
18:26:58.39 |
-61:45:55.4 |
HIP 90387 |
6.87 |
| 2026-02-07 12:00 |
18:27:06.01 |
-61:46:17.8 |
HIP 90387 |
7.60 |
| 2026-02-08 00:00 |
18:27:13.57 |
-61:46:40.5 |
HIP 90387 |
8.38 |
| 2026-02-08 12:00 |
18:27:21.09 |
-61:47:03.5 |
HIP 90387 |
9.20 |
| 2026-02-09 00:00 |
18:27:28.56 |
-61:47:26.7 |
HIP 90387 |
10.04 |
| 2026-02-09 12:00 |
18:27:35.98 |
-61:47:50.1 |
HIP 90387 |
10.91 |
| 2026-02-10 00:00 |
18:27:43.34 |
-61:48:13.8 |
HIP 90387 |
11.78 |
| 2026-02-10 12:00 |
18:27:50.66 |
-61:48:37.8 |
HIP 90387 |
12.67 |
| 2026-02-11 00:00 |
18:27:57.93 |
-61:49:01.9 |
HIP 90387 |
13.57 |
| 2026-02-11 12:00 |
18:28:05.14 |
-61:49:26.4 |
HIP 90387 |
14.47 |
| 2026-02-12 00:00 |
18:28:12.30 |
-61:49:51.1 |
HIP 90677 |
13.82 |
| 2026-02-12 12:00 |
18:28:19.41 |
-61:50:16.0 |
HIP 90677 |
13.13 |
| 2026-02-13 00:00 |
18:28:26.46 |
-61:50:41.1 |
HIP 90677 |
12.48 |
| 2026-02-13 12:00 |
18:28:33.46 |
-61:51:06.5 |
HIP 90677 |
11.87 |
| 2026-02-14 00:00 |
18:28:40.41 |
-61:51:32.2 |
HIP 90677 |
11.32 |
| 2026-02-14 12:00 |
18:28:47.30 |
-61:51:58.0 |
HIP 90677 |
10.82 |
| 2026-02-15 00:00 |
18:28:54.13 |
-61:52:24.1 |
HIP 90677 |
10.39 |
| 2026-02-15 12:00 |
18:29:00.91 |
-61:52:50.5 |
HIP 90677 |
10.03 |
| 2026-02-16 00:00 |
18:29:07.63 |
-61:53:17.0 |
HIP 90677 |
9.75 |
| 2026-02-16 12:00 |
18:29:14.30 |
-61:53:43.8 |
HIP 90677 |
9.56 |
| 2026-02-17 00:00 |
18:29:20.91 |
-61:54:10.9 |
HIP 90677 |
9.46 |
| 2026-02-17 12:00 |
18:29:27.46 |
-61:54:38.1 |
HIP 90677 |
9.45 |
| 2026-02-18 00:00 |
18:29:33.95 |
-61:55:05.6 |
HIP 90677 |
9.53 |
| 2026-02-18 12:00 |
18:29:40.39 |
-61:55:33.3 |
HIP 90677 |
9.70 |
| 2026-02-19 00:00 |
18:29:46.76 |
-61:56:01.2 |
HIP 90677 |
9.95 |
| 2026-02-19 12:00 |
18:29:53.08 |
-61:56:29.4 |
HIP 90677 |
10.28 |
| 2026-02-20 00:00 |
18:29:59.34 |
-61:56:57.7 |
HIP 90677 |
10.67 |
| 2026-02-20 12:00 |
18:30:05.53 |
-61:57:26.3 |
HIP 90677 |
11.12 |
| 2026-02-21 00:00 |
18:30:11.67 |
-61:57:55.1 |
HIP 90677 |
11.63 |
| 2026-02-21 12:00 |
18:30:17.74 |
-61:58:24.1 |
HIP 90677 |
12.17 |
| 2026-02-22 00:00 |
18:30:23.75 |
-61:58:53.3 |
HIP 90677 |
12.76 |
| 2026-02-22 12:00 |
18:30:29.70 |
-61:59:22.7 |
HIP 90677 |
13.37 |
| 2026-02-23 00:00 |
18:30:35.59 |
-61:59:52.3 |
HIP 90677 |
14.02 |
| 2026-02-23 12:00 |
18:30:41.41 |
-62:00:22.1 |
HIP 90677 |
14.68 |
| 2026-02-24 00:00 |
18:30:47.17 |
-62:00:52.2 |
HIP 90677 |
15.36 |