279P/La Sagra
| Parameter |
Value |
| Designation |
279P/La Sagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-10-09T20:52:39.947520Z |
| Orbit solution date (soln_date, UTC) |
2024-01-04T23:43:56Z |
| Obs used |
290 |
| NEO |
- |
| M1 |
16.000 |
| K1 |
8.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-10-26.0000000 |
| e |
0.39785019 |
| q (au) |
2.152931 |
| a (au) |
3.575408 |
| i (deg) |
5.051399 |
| Ω (om, deg) |
346.279437 |
| ω (w, deg) |
6.015546 |
| M (ma, deg) |
162.132940 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.300 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.300 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.309 |
| 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 |
10:58:08.41 |
+07:37:47.8 |
HIP 53486 |
28.16 |
| 2026-02-03 12:00 |
10:57:53.29 |
+07:39:09.9 |
HIP 53486 |
25.84 |
| 2026-02-04 00:00 |
10:57:38.02 |
+07:40:32.7 |
HIP 53486 |
23.94 |
| 2026-02-04 12:00 |
10:57:22.61 |
+07:41:56.3 |
HIP 53440 |
21.27 |
| 2026-02-05 00:00 |
10:57:07.06 |
+07:43:20.7 |
HIP 53440 |
17.58 |
| 2026-02-05 12:00 |
10:56:51.37 |
+07:44:45.8 |
HIP 53440 |
14.08 |
| 2026-02-06 00:00 |
10:56:35.55 |
+07:46:11.6 |
HIP 53440 |
11.00 |
| 2026-02-06 12:00 |
10:56:19.59 |
+07:47:38.0 |
HIP 53440 |
8.86 |
| 2026-02-07 00:00 |
10:56:03.50 |
+07:49:05.2 |
HIP 53440 |
8.46 |
| 2026-02-07 12:00 |
10:55:47.28 |
+07:50:33.0 |
HIP 53440 |
10.05 |
| 2026-02-08 00:00 |
10:55:30.94 |
+07:52:01.5 |
HIP 53440 |
12.94 |
| 2026-02-08 12:00 |
10:55:14.47 |
+07:53:30.6 |
HIP 53440 |
16.50 |
| 2026-02-09 00:00 |
10:54:57.89 |
+07:55:00.3 |
HIP 53440 |
20.39 |
| 2026-02-09 12:00 |
10:54:41.18 |
+07:56:30.6 |
HIP 53318 |
20.64 |
| 2026-02-10 00:00 |
10:54:24.36 |
+07:58:01.5 |
HIP 53318 |
21.50 |
| 2026-02-10 12:00 |
10:54:07.42 |
+07:59:32.9 |
HIP 53318 |
23.21 |
| 2026-02-11 00:00 |
10:53:50.37 |
+08:01:04.9 |
HIP 53148 |
24.08 |
| 2026-02-11 12:00 |
10:53:33.22 |
+08:02:37.5 |
HIP 53148 |
19.63 |
| 2026-02-12 00:00 |
10:53:15.96 |
+08:04:10.5 |
HIP 53148 |
15.20 |
| 2026-02-12 12:00 |
10:52:58.59 |
+08:05:44.0 |
HIP 53148 |
10.84 |
| 2026-02-13 00:00 |
10:52:41.13 |
+08:07:18.0 |
HIP 53148 |
6.75 |
| 2026-02-13 12:00 |
10:52:23.57 |
+08:08:52.5 |
HIP 53148 |
3.98 |
| 2026-02-14 00:00 |
10:52:05.92 |
+08:10:27.4 |
HIP 53148 |
5.39 |
| 2026-02-14 12:00 |
10:51:48.18 |
+08:12:02.7 |
HIP 53148 |
9.26 |
| 2026-02-15 00:00 |
10:51:30.35 |
+08:13:38.4 |
HIP 53148 |
13.66 |
| 2026-02-15 12:00 |
10:51:12.43 |
+08:15:14.5 |
HIP 53148 |
18.23 |
| 2026-02-16 00:00 |
10:50:54.44 |
+08:16:50.9 |
HIP 53071 |
22.37 |
| 2026-02-16 12:00 |
10:50:36.36 |
+08:18:27.7 |
HIP 53071 |
25.79 |
| 2026-02-17 00:00 |
10:50:18.21 |
+08:20:04.8 |
HIP 52871 |
24.28 |
| 2026-02-17 12:00 |
10:49:59.99 |
+08:21:42.2 |
HIP 52871 |
20.60 |
| 2026-02-18 00:00 |
10:49:41.70 |
+08:23:19.9 |
HIP 52871 |
17.47 |
| 2026-02-18 12:00 |
10:49:23.34 |
+08:24:57.8 |
HIP 52871 |
15.22 |
| 2026-02-19 00:00 |
10:49:04.92 |
+08:26:36.0 |
HIP 52871 |
14.32 |
| 2026-02-19 12:00 |
10:48:46.44 |
+08:28:14.4 |
HIP 52871 |
15.01 |
| 2026-02-20 00:00 |
10:48:27.91 |
+08:29:53.0 |
HIP 52871 |
17.11 |
| 2026-02-20 12:00 |
10:48:09.32 |
+08:31:31.8 |
HIP 52838 |
18.43 |
| 2026-02-21 00:00 |
10:47:50.68 |
+08:33:10.7 |
HIP 52838 |
17.65 |
| 2026-02-21 12:00 |
10:47:32.00 |
+08:34:49.7 |
HIP 52838 |
18.21 |
| 2026-02-22 00:00 |
10:47:13.28 |
+08:36:28.9 |
HIP 52838 |
19.99 |
| 2026-02-22 12:00 |
10:46:54.52 |
+08:38:08.2 |
HIP 52838 |
22.72 |
| 2026-02-23 00:00 |
10:46:35.72 |
+08:39:47.5 |
HIP 52838 |
26.11 |
| 2026-02-23 12:00 |
10:46:16.89 |
+08:41:26.9 |
HIP 52838 |
29.94 |
| 2026-02-24 00:00 |
10:45:58.03 |
+08:43:06.4 |
HIP 52528 |
25.64 |