379P/Spacewatch
| Parameter |
Value |
| Designation |
379P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-12-13T11:49:26.428800Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T15:43:08Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
19.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-02-28T09:07:17.184000Z |
| Discovery magnitude (MPC) |
20.10 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-03-04.0000000 |
| e |
0.33665897 |
| q (au) |
2.341865 |
| a (au) |
3.530408 |
| i (deg) |
12.378424 |
| Ω (om, deg) |
184.059192 |
| ω (w, deg) |
31.064726 |
| M (ma, deg) |
11.961953 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.769 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.769 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.915 |
| δ90 |
1.000 |
| 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 |
15:29:31.36 |
-13:27:06.7 |
HIP 75931 |
20.32 |
| 2026-02-03 12:00 |
15:30:20.80 |
-13:27:11.0 |
HIP 75931 |
14.15 |
| 2026-02-04 00:00 |
15:31:10.09 |
-13:27:13.0 |
HIP 75931 |
16.64 |
| 2026-02-04 12:00 |
15:31:59.21 |
-13:27:12.8 |
HIP 75931 |
25.29 |
| 2026-02-05 00:00 |
15:32:48.18 |
-13:27:10.4 |
HIP 76153 |
27.21 |
| 2026-02-05 12:00 |
15:33:36.97 |
-13:27:05.7 |
HIP 76153 |
26.86 |
| 2026-02-06 00:00 |
15:34:25.60 |
-13:26:58.7 |
HIP 76323 |
16.18 |
| 2026-02-06 12:00 |
15:35:14.06 |
-13:26:49.5 |
HIP 76323 |
8.00 |
| 2026-02-07 00:00 |
15:36:02.35 |
-13:26:38.0 |
HIP 76323 |
11.94 |
| 2026-02-07 12:00 |
15:36:50.46 |
-13:26:24.3 |
HIP 76484 |
7.31 |
| 2026-02-08 00:00 |
15:37:38.39 |
-13:26:08.2 |
HIP 76484 |
6.67 |
| 2026-02-08 12:00 |
15:38:26.15 |
-13:25:49.9 |
HIP 76484 |
17.48 |
| 2026-02-09 00:00 |
15:39:13.72 |
-13:25:29.3 |
HIP 76622 |
25.61 |
| 2026-02-09 12:00 |
15:40:01.11 |
-13:25:06.4 |
HIP 76789 |
28.09 |
| 2026-02-10 00:00 |
15:40:48.31 |
-13:24:41.3 |
HIP 76789 |
26.55 |
| 2026-02-10 12:00 |
15:41:35.32 |
-13:24:13.8 |
HIP 76983 |
24.64 |
| 2026-02-11 00:00 |
15:42:22.14 |
-13:23:44.1 |
HIP 76983 |
14.97 |
| 2026-02-11 12:00 |
15:43:08.77 |
-13:23:12.0 |
HIP 76983 |
10.07 |
| 2026-02-12 00:00 |
15:43:55.20 |
-13:22:37.6 |
HIP 76983 |
15.37 |
| 2026-02-12 12:00 |
15:44:41.43 |
-13:22:00.9 |
HIP 76983 |
25.00 |
| 2026-02-13 00:00 |
15:45:27.46 |
-13:21:22.0 |
HIP 76983 |
35.57 |
| 2026-02-13 12:00 |
15:46:13.28 |
-13:20:40.7 |
HIP 77433 |
33.35 |
| 2026-02-14 00:00 |
15:46:58.90 |
-13:19:57.1 |
HIP 77433 |
23.20 |
| 2026-02-14 12:00 |
15:47:44.30 |
-13:19:11.1 |
HIP 77433 |
14.63 |
| 2026-02-15 00:00 |
15:48:29.50 |
-13:18:22.9 |
HIP 77433 |
11.63 |
| 2026-02-15 12:00 |
15:49:14.48 |
-13:17:32.3 |
HIP 77433 |
17.29 |
| 2026-02-16 00:00 |
15:49:59.24 |
-13:16:39.5 |
HIP 77609 |
12.08 |
| 2026-02-16 12:00 |
15:50:43.78 |
-13:15:44.3 |
HIP 77609 |
8.04 |
| 2026-02-17 00:00 |
15:51:28.11 |
-13:14:46.8 |
HIP 77609 |
14.81 |
| 2026-02-17 12:00 |
15:52:12.20 |
-13:13:46.9 |
HIP 77812 |
24.59 |
| 2026-02-18 00:00 |
15:52:56.07 |
-13:12:44.8 |
HIP 77812 |
20.10 |
| 2026-02-18 12:00 |
15:53:39.71 |
-13:11:40.3 |
HIP 77812 |
20.83 |
| 2026-02-19 00:00 |
15:54:23.11 |
-13:10:33.5 |
HIP 77812 |
26.30 |
| 2026-02-19 12:00 |
15:55:06.28 |
-13:09:24.5 |
HIP 78084 |
26.56 |
| 2026-02-20 00:00 |
15:55:49.22 |
-13:08:13.0 |
HIP 78084 |
17.64 |
| 2026-02-20 12:00 |
15:56:31.91 |
-13:06:59.3 |
HIP 78107 |
10.52 |
| 2026-02-21 00:00 |
15:57:14.36 |
-13:05:43.3 |
HIP 78107 |
8.85 |
| 2026-02-21 12:00 |
15:57:56.57 |
-13:04:25.0 |
HIP 78271 |
15.78 |
| 2026-02-22 00:00 |
15:58:38.53 |
-13:03:04.3 |
HIP 78271 |
8.40 |
| 2026-02-22 12:00 |
15:59:20.24 |
-13:01:41.4 |
HIP 78315 |
2.91 |
| 2026-02-23 00:00 |
16:00:01.71 |
-13:00:16.2 |
HIP 78315 |
8.43 |
| 2026-02-23 12:00 |
16:00:42.91 |
-12:58:48.7 |
HIP 78455 |
7.75 |
| 2026-02-24 00:00 |
16:01:23.87 |
-12:57:18.9 |
HIP 78455 |
7.45 |