| 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) |
| 2026-03-26 00:00 |
10:28:12.18 |
+10:12:27.8 |
HIP 51168 |
21.72 |
| 2026-03-26 12:00 |
10:27:57.37 |
+10:13:37.1 |
HIP 51168 |
18.28 |
| 2026-03-27 00:00 |
10:27:42.71 |
+10:14:45.5 |
HIP 51168 |
15.07 |
| 2026-03-27 12:00 |
10:27:28.21 |
+10:15:53.0 |
HIP 51168 |
12.21 |
| 2026-03-28 00:00 |
10:27:13.86 |
+10:16:59.5 |
HIP 51168 |
9.98 |
| 2026-03-28 12:00 |
10:26:59.66 |
+10:18:05.1 |
HIP 51168 |
8.81 |
| 2026-03-29 00:00 |
10:26:45.63 |
+10:19:09.7 |
HIP 51168 |
9.07 |
| 2026-03-29 12:00 |
10:26:31.75 |
+10:20:13.3 |
HIP 51105 |
10.04 |
| 2026-03-30 00:00 |
10:26:18.03 |
+10:21:16.0 |
HIP 51105 |
9.15 |
| 2026-03-30 12:00 |
10:26:04.48 |
+10:22:17.7 |
HIP 51105 |
9.57 |
| 2026-03-31 00:00 |
10:25:51.08 |
+10:23:18.5 |
HIP 51105 |
11.10 |
| 2026-03-31 12:00 |
10:25:37.86 |
+10:24:18.2 |
HIP 51105 |
13.33 |
| 2026-04-01 00:00 |
10:25:24.80 |
+10:25:16.9 |
HIP 51105 |
15.95 |
| 2026-04-01 12:00 |
10:25:11.91 |
+10:26:14.7 |
HIP 50950 |
15.72 |
| 2026-04-02 00:00 |
10:24:59.19 |
+10:27:11.4 |
HIP 50950 |
12.66 |
| 2026-04-02 12:00 |
10:24:46.64 |
+10:28:07.2 |
HIP 50950 |
9.77 |
| 2026-04-03 00:00 |
10:24:34.26 |
+10:29:01.9 |
HIP 50950 |
7.21 |
| 2026-04-03 12:00 |
10:24:22.06 |
+10:29:55.6 |
HIP 50950 |
5.38 |
| 2026-04-04 00:00 |
10:24:10.04 |
+10:30:48.2 |
HIP 50950 |
5.04 |
| 2026-04-04 12:00 |
10:23:58.19 |
+10:31:39.8 |
HIP 50950 |
6.37 |
| 2026-04-05 00:00 |
10:23:46.51 |
+10:32:30.4 |
HIP 50950 |
8.57 |
| 2026-04-05 12:00 |
10:23:35.02 |
+10:33:20.0 |
HIP 50950 |
11.11 |
| 2026-04-06 00:00 |
10:23:23.71 |
+10:34:08.5 |
HIP 50950 |
13.77 |
| 2026-04-06 12:00 |
10:23:12.58 |
+10:34:55.9 |
HIP 50950 |
16.46 |
| 2026-04-07 00:00 |
10:23:01.63 |
+10:35:42.3 |
HIP 50950 |
19.15 |
| 2026-04-07 12:00 |
10:22:50.87 |
+10:36:27.7 |
HIP 50950 |
21.82 |
| 2026-04-08 00:00 |
10:22:40.29 |
+10:37:11.9 |
HIP 50950 |
24.47 |
| 2026-04-08 12:00 |
10:22:29.90 |
+10:37:55.1 |
HIP 50950 |
27.07 |
| 2026-04-09 00:00 |
10:22:19.69 |
+10:38:37.3 |
HIP 50729 |
28.84 |
| 2026-04-09 12:00 |
10:22:09.67 |
+10:39:18.3 |
HIP 50729 |
27.24 |
| 2026-04-10 00:00 |
10:21:59.85 |
+10:39:58.3 |
HIP 50729 |
25.82 |
| 2026-04-10 12:00 |
10:21:50.21 |
+10:40:37.2 |
HIP 50729 |
24.60 |
| 2026-04-11 00:00 |
10:21:40.76 |
+10:41:15.0 |
HIP 50611 |
23.06 |
| 2026-04-11 12:00 |
10:21:31.51 |
+10:41:51.7 |
HIP 50611 |
20.78 |
| 2026-04-12 00:00 |
10:21:22.45 |
+10:42:27.3 |
HIP 50611 |
18.56 |
| 2026-04-12 12:00 |
10:21:13.58 |
+10:43:01.8 |
HIP 50611 |
16.41 |
| 2026-04-13 00:00 |
10:21:04.91 |
+10:43:35.2 |
HIP 50611 |
14.35 |
| 2026-04-13 12:00 |
10:20:56.43 |
+10:44:07.5 |
HIP 50611 |
12.38 |
| 2026-04-14 00:00 |
10:20:48.15 |
+10:44:38.8 |
HIP 50611 |
10.53 |
| 2026-04-14 12:00 |
10:20:40.06 |
+10:45:08.9 |
HIP 50611 |
8.84 |
| 2026-04-15 00:00 |
10:20:32.18 |
+10:45:37.8 |
HIP 50611 |
7.38 |
| 2026-04-15 12:00 |
10:20:24.49 |
+10:46:05.7 |
HIP 50611 |
6.24 |
| 2026-04-16 00:00 |
10:20:17.00 |
+10:46:32.5 |
HIP 50611 |
5.59 |