| Parameter |
Value |
| Designation |
P/2012 NJ (La Sagra) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-06-13T02:10:00.287040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:19Z |
| Obs used |
2490 |
| NEO |
Yes |
| M1 |
14.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-08-19.0000000 |
| e |
0.84806204 |
| q (au) |
1.291890 |
| a (au) |
8.502747 |
| i (deg) |
84.375461 |
| Ω (om, deg) |
315.763185 |
| ω (w, deg) |
338.413906 |
| M (ma, deg) |
2.659833 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.413 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.413 |
| 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 |
09:13:50.11 |
+34:07:21.0 |
HIP 45325 |
19.01 |
| 2026-06-01 12:00 |
09:13:53.34 |
+34:06:26.3 |
HIP 45325 |
17.96 |
| 2026-06-02 00:00 |
09:13:56.63 |
+34:05:31.5 |
HIP 45325 |
16.91 |
| 2026-06-02 12:00 |
09:13:59.98 |
+34:04:36.6 |
HIP 45325 |
15.87 |
| 2026-06-03 00:00 |
09:14:03.39 |
+34:03:41.6 |
HIP 45325 |
14.85 |
| 2026-06-03 12:00 |
09:14:06.87 |
+34:02:46.6 |
HIP 45325 |
13.84 |
| 2026-06-04 00:00 |
09:14:10.40 |
+34:01:51.5 |
HIP 45325 |
12.86 |
| 2026-06-04 12:00 |
09:14:13.99 |
+34:00:56.4 |
HIP 45325 |
11.91 |
| 2026-06-05 00:00 |
09:14:17.64 |
+34:00:01.2 |
HIP 45325 |
11.01 |
| 2026-06-05 12:00 |
09:14:21.35 |
+33:59:05.9 |
HIP 45325 |
10.17 |
| 2026-06-06 00:00 |
09:14:25.11 |
+33:58:10.5 |
HIP 45325 |
9.41 |
| 2026-06-06 12:00 |
09:14:28.94 |
+33:57:15.1 |
HIP 45325 |
8.75 |
| 2026-06-07 00:00 |
09:14:32.82 |
+33:56:19.7 |
HIP 45325 |
8.23 |
| 2026-06-07 12:00 |
09:14:36.76 |
+33:55:24.2 |
HIP 45325 |
7.87 |
| 2026-06-08 00:00 |
09:14:40.76 |
+33:54:28.6 |
HIP 45325 |
7.70 |
| 2026-06-08 12:00 |
09:14:44.81 |
+33:53:33.0 |
HIP 45325 |
7.74 |
| 2026-06-09 00:00 |
09:14:48.92 |
+33:52:37.4 |
HIP 45325 |
7.99 |
| 2026-06-09 12:00 |
09:14:53.09 |
+33:51:41.7 |
HIP 45325 |
8.43 |
| 2026-06-10 00:00 |
09:14:57.31 |
+33:50:45.9 |
HIP 45325 |
9.05 |
| 2026-06-10 12:00 |
09:15:01.58 |
+33:49:50.2 |
HIP 45325 |
9.80 |
| 2026-06-11 00:00 |
09:15:05.91 |
+33:48:54.4 |
HIP 45325 |
10.67 |
| 2026-06-11 12:00 |
09:15:10.30 |
+33:47:58.5 |
HIP 45325 |
11.63 |
| 2026-06-12 00:00 |
09:15:14.74 |
+33:47:02.7 |
HIP 45325 |
12.66 |
| 2026-06-12 12:00 |
09:15:19.23 |
+33:46:06.8 |
HIP 45484 |
12.72 |
| 2026-06-13 00:00 |
09:15:23.78 |
+33:45:10.8 |
HIP 45484 |
12.69 |
| 2026-06-13 12:00 |
09:15:28.38 |
+33:44:14.9 |
HIP 45484 |
12.79 |
| 2026-06-14 00:00 |
09:15:33.03 |
+33:43:18.9 |
HIP 45484 |
13.03 |
| 2026-06-14 12:00 |
09:15:37.74 |
+33:42:22.9 |
HIP 45484 |
13.39 |
| 2026-06-15 00:00 |
09:15:42.49 |
+33:41:26.9 |
HIP 45484 |
13.87 |
| 2026-06-15 12:00 |
09:15:47.30 |
+33:40:30.9 |
HIP 45484 |
14.46 |
| 2026-06-16 00:00 |
09:15:52.16 |
+33:39:34.9 |
HIP 45484 |
15.15 |
| 2026-06-16 12:00 |
09:15:57.07 |
+33:38:38.9 |
HIP 45484 |
15.92 |
| 2026-06-17 00:00 |
09:16:02.03 |
+33:37:42.8 |
HIP 45484 |
16.78 |
| 2026-06-17 12:00 |
09:16:07.04 |
+33:36:46.8 |
HIP 45572 |
16.23 |
| 2026-06-18 00:00 |
09:16:12.10 |
+33:35:50.8 |
HIP 45572 |
14.89 |
| 2026-06-18 12:00 |
09:16:17.20 |
+33:34:54.7 |
HIP 45572 |
13.56 |
| 2026-06-19 00:00 |
09:16:22.36 |
+33:33:58.7 |
HIP 45572 |
12.23 |
| 2026-06-19 12:00 |
09:16:27.56 |
+33:33:02.7 |
HIP 45572 |
10.92 |
| 2026-06-20 00:00 |
09:16:32.81 |
+33:32:06.7 |
HIP 45572 |
9.63 |
| 2026-06-20 12:00 |
09:16:38.10 |
+33:31:10.7 |
HIP 45572 |
8.38 |
| 2026-06-21 00:00 |
09:16:43.45 |
+33:30:14.7 |
HIP 45572 |
7.19 |
| 2026-06-21 12:00 |
09:16:48.84 |
+33:29:18.7 |
HIP 45572 |
6.11 |
| 2026-06-22 00:00 |
09:16:54.27 |
+33:28:22.8 |
HIP 45572 |
5.21 |