| 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) |
| 2026-07-29 00:00 |
09:25:12.52 |
+32:22:45.9 |
HIP 46174 |
15.83 |
| 2026-07-29 12:00 |
09:25:20.13 |
+32:21:57.5 |
HIP 46174 |
15.47 |
| 2026-07-30 00:00 |
09:25:27.76 |
+32:21:09.1 |
HIP 46174 |
15.33 |
| 2026-07-30 12:00 |
09:25:35.39 |
+32:20:21.0 |
HIP 46174 |
15.39 |
| 2026-07-31 00:00 |
09:25:43.04 |
+32:19:33.1 |
HIP 46174 |
15.68 |
| 2026-07-31 12:00 |
09:25:50.70 |
+32:18:45.3 |
HIP 46174 |
16.16 |
| 2026-08-01 00:00 |
09:25:58.37 |
+32:17:57.7 |
HIP 46174 |
16.83 |
| 2026-08-01 12:00 |
09:26:06.05 |
+32:17:10.3 |
HIP 46174 |
17.66 |
| 2026-08-02 00:00 |
09:26:13.74 |
+32:16:23.1 |
HIP 46174 |
18.64 |
| 2026-08-02 12:00 |
09:26:21.44 |
+32:15:36.0 |
HIP 46174 |
19.73 |
| 2026-08-03 00:00 |
09:26:29.15 |
+32:14:49.2 |
HIP 46174 |
20.93 |
| 2026-08-03 12:00 |
09:26:36.87 |
+32:14:02.6 |
HIP 46174 |
22.21 |
| 2026-08-04 00:00 |
09:26:44.59 |
+32:13:16.1 |
HIP 46174 |
23.57 |
| 2026-08-04 12:00 |
09:26:52.32 |
+32:12:29.8 |
HIP 46174 |
24.98 |
| 2026-08-05 00:00 |
09:27:00.06 |
+32:11:43.8 |
HIP 46174 |
26.45 |
| 2026-08-05 12:00 |
09:27:07.81 |
+32:10:57.9 |
HIP 46174 |
27.96 |
| 2026-08-06 00:00 |
09:27:15.56 |
+32:10:12.2 |
HIP 46174 |
29.50 |
| 2026-08-06 12:00 |
09:27:23.32 |
+32:09:26.8 |
HIP 46174 |
31.08 |
| 2026-08-07 00:00 |
09:27:31.08 |
+32:08:41.5 |
HIP 46174 |
32.68 |
| 2026-08-07 12:00 |
09:27:38.85 |
+32:07:56.5 |
HIP 46590 |
31.01 |
| 2026-08-08 00:00 |
09:27:46.62 |
+32:07:11.6 |
HIP 46590 |
29.26 |
| 2026-08-08 12:00 |
09:27:54.40 |
+32:06:27.0 |
HIP 46590 |
27.52 |
| 2026-08-09 00:00 |
09:28:02.18 |
+32:05:42.6 |
HIP 46590 |
25.79 |
| 2026-08-09 12:00 |
09:28:09.96 |
+32:04:58.4 |
HIP 46590 |
24.07 |
| 2026-08-10 00:00 |
09:28:17.75 |
+32:04:14.4 |
HIP 46590 |
22.36 |
| 2026-08-10 12:00 |
09:28:25.54 |
+32:03:30.6 |
HIP 46590 |
20.67 |
| 2026-08-11 00:00 |
09:28:33.33 |
+32:02:47.1 |
HIP 46590 |
19.00 |
| 2026-08-11 12:00 |
09:28:41.12 |
+32:02:03.8 |
HIP 46590 |
17.35 |
| 2026-08-12 00:00 |
09:28:48.91 |
+32:01:20.7 |
HIP 46590 |
15.74 |
| 2026-08-12 12:00 |
09:28:56.70 |
+32:00:37.9 |
HIP 46590 |
14.17 |
| 2026-08-13 00:00 |
09:29:04.49 |
+31:59:55.2 |
HIP 46590 |
12.66 |
| 2026-08-13 12:00 |
09:29:12.28 |
+31:59:12.8 |
HIP 46590 |
11.23 |
| 2026-08-14 00:00 |
09:29:20.07 |
+31:58:30.7 |
HIP 46590 |
9.92 |
| 2026-08-14 12:00 |
09:29:27.86 |
+31:57:48.8 |
HIP 46590 |
8.79 |
| 2026-08-15 00:00 |
09:29:35.64 |
+31:57:07.1 |
HIP 46590 |
7.89 |
| 2026-08-15 12:00 |
09:29:43.42 |
+31:56:25.6 |
HIP 46590 |
7.33 |
| 2026-08-16 00:00 |
09:29:51.20 |
+31:55:44.4 |
HIP 46590 |
7.18 |
| 2026-08-16 12:00 |
09:29:58.97 |
+31:55:03.5 |
HIP 46590 |
7.47 |
| 2026-08-17 00:00 |
09:30:06.74 |
+31:54:22.8 |
HIP 46590 |
8.14 |
| 2026-08-17 12:00 |
09:30:14.51 |
+31:53:42.3 |
HIP 46590 |
9.11 |
| 2026-08-18 00:00 |
09:30:22.27 |
+31:53:02.1 |
HIP 46590 |
10.29 |
| 2026-08-18 12:00 |
09:30:30.02 |
+31:52:22.2 |
HIP 46590 |
11.62 |
| 2026-08-19 00:00 |
09:30:37.77 |
+31:51:42.5 |
HIP 46707 |
11.32 |