| Parameter |
Value |
| Designation |
379P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-08-01T10:52:20.582400Z |
| Orbit solution date (soln_date, UTC) |
2026-07-16T19:12:28Z |
| Obs used |
167 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
15.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-02-28T09:07:17.184000Z |
| Discovery magnitude (MPC) |
20.10 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-05-15.0000000 |
| e |
0.33800704 |
| q (au) |
2.334146 |
| a (au) |
3.525938 |
| i (deg) |
12.385500 |
| Ω (om, deg) |
184.033870 |
| ω (w, deg) |
31.156663 |
| M (ma, deg) |
293.985450 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.541 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.541 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.734 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
17:03:45.38 |
-10:19:52.8 |
HIP 83372 |
42.44 |
| 2026-09-20 12:00 |
17:04:24.85 |
-10:22:41.4 |
HIP 83711 |
39.99 |
| 2026-09-21 00:00 |
17:05:04.47 |
-10:25:28.9 |
HIP 83711 |
31.01 |
| 2026-09-21 12:00 |
17:05:44.23 |
-10:28:15.5 |
HIP 83711 |
23.00 |
| 2026-09-22 00:00 |
17:06:24.13 |
-10:31:01.1 |
HIP 83711 |
17.41 |
| 2026-09-22 12:00 |
17:07:04.18 |
-10:33:45.7 |
HIP 83711 |
16.91 |
| 2026-09-23 00:00 |
17:07:44.37 |
-10:36:29.3 |
HIP 83711 |
21.89 |
| 2026-09-23 12:00 |
17:08:24.70 |
-10:39:11.9 |
HIP 83962 |
21.89 |
| 2026-09-24 00:00 |
17:09:05.16 |
-10:41:53.5 |
HIP 83962 |
14.86 |
| 2026-09-24 12:00 |
17:09:45.77 |
-10:44:34.0 |
HIP 83962 |
13.20 |
| 2026-09-25 00:00 |
17:10:26.50 |
-10:47:13.6 |
HIP 84026 |
5.94 |
| 2026-09-25 12:00 |
17:11:07.38 |
-10:49:52.1 |
HIP 84026 |
8.02 |
| 2026-09-26 00:00 |
17:11:48.38 |
-10:52:29.5 |
HIP 84026 |
17.60 |
| 2026-09-26 12:00 |
17:12:29.52 |
-10:55:05.9 |
HIP 84026 |
27.81 |
| 2026-09-27 00:00 |
17:13:10.79 |
-10:57:41.3 |
HIP 84026 |
38.16 |
| 2026-09-27 12:00 |
17:13:52.19 |
-11:00:15.6 |
HIP 84476 |
34.69 |
| 2026-09-28 00:00 |
17:14:33.71 |
-11:02:48.9 |
HIP 84476 |
25.56 |
| 2026-09-28 12:00 |
17:15:15.36 |
-11:05:21.0 |
HIP 84476 |
17.97 |
| 2026-09-29 00:00 |
17:15:57.14 |
-11:07:52.1 |
HIP 84476 |
14.62 |
| 2026-09-29 12:00 |
17:16:39.05 |
-11:10:22.2 |
HIP 84539 |
17.09 |
| 2026-09-30 00:00 |
17:17:21.08 |
-11:12:51.1 |
HIP 84539 |
19.74 |
| 2026-09-30 12:00 |
17:18:03.23 |
-11:15:18.9 |
HIP 84728 |
18.44 |
| 2026-10-01 00:00 |
17:18:45.50 |
-11:17:45.6 |
HIP 84728 |
12.09 |
| 2026-10-01 12:00 |
17:19:27.89 |
-11:20:11.3 |
HIP 84789 |
5.97 |
| 2026-10-02 00:00 |
17:20:10.41 |
-11:22:35.8 |
HIP 84789 |
4.77 |
| 2026-10-02 12:00 |
17:20:53.04 |
-11:24:59.2 |
HIP 84789 |
15.47 |
| 2026-10-03 00:00 |
17:21:35.80 |
-11:27:21.5 |
HIP 84789 |
26.21 |
| 2026-10-03 12:00 |
17:22:18.67 |
-11:29:42.6 |
HIP 85151 |
28.36 |
| 2026-10-04 00:00 |
17:23:01.65 |
-11:32:02.6 |
HIP 85151 |
18.04 |
| 2026-10-04 12:00 |
17:23:44.76 |
-11:34:21.5 |
HIP 85151 |
8.93 |
| 2026-10-05 00:00 |
17:24:27.97 |
-11:36:39.2 |
HIP 85151 |
8.24 |
| 2026-10-05 12:00 |
17:25:11.30 |
-11:38:55.7 |
HIP 85151 |
17.07 |
| 2026-10-06 00:00 |
17:25:54.75 |
-11:41:11.1 |
HIP 85151 |
27.42 |
| 2026-10-06 12:00 |
17:26:38.30 |
-11:43:25.3 |
HIP 85455 |
32.59 |
| 2026-10-07 00:00 |
17:27:21.97 |
-11:45:38.4 |
HIP 85455 |
26.34 |
| 2026-10-07 12:00 |
17:28:05.75 |
-11:47:50.2 |
HIP 85455 |
23.77 |
| 2026-10-08 00:00 |
17:28:49.63 |
-11:50:00.9 |
HIP 85658 |
25.44 |
| 2026-10-08 12:00 |
17:29:33.63 |
-11:52:10.4 |
HIP 85658 |
18.66 |
| 2026-10-09 00:00 |
17:30:17.73 |
-11:54:18.7 |
HIP 85658 |
17.03 |
| 2026-10-09 12:00 |
17:31:01.93 |
-11:56:25.7 |
HIP 85658 |
21.76 |
| 2026-10-10 00:00 |
17:31:46.24 |
-11:58:31.6 |
HIP 85658 |
30.00 |
| 2026-10-10 12:00 |
17:32:30.65 |
-12:00:36.2 |
HIP 85809 |
31.69 |
| 2026-10-11 00:00 |
17:33:15.17 |
-12:02:39.6 |
HIP 85809 |
34.07 |