メタデータ
| 項目 |
値 |
| 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 |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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 |
等級
散乱 + 全体線形
$$
M_a = (14.541 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.541 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.734 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
16:13:04.55 |
-04:32:04.7 |
HIP 79463 |
18.94 |
| 2026-07-29 12:00 |
16:13:19.62 |
-04:35:19.4 |
HIP 79463 |
22.81 |
| 2026-07-30 00:00 |
16:13:35.00 |
-04:38:34.8 |
HIP 79463 |
27.08 |
| 2026-07-30 12:00 |
16:13:50.70 |
-04:41:50.9 |
HIP 79681 |
30.72 |
| 2026-07-31 00:00 |
16:14:06.72 |
-04:45:07.8 |
HIP 79681 |
25.80 |
| 2026-07-31 12:00 |
16:14:23.05 |
-04:48:25.3 |
HIP 79681 |
20.93 |
| 2026-08-01 00:00 |
16:14:39.68 |
-04:51:43.6 |
HIP 79681 |
16.21 |
| 2026-08-01 12:00 |
16:14:56.63 |
-04:55:02.4 |
HIP 79681 |
11.92 |
| 2026-08-02 00:00 |
16:15:13.89 |
-04:58:21.8 |
HIP 79681 |
8.81 |
| 2026-08-02 12:00 |
16:15:31.45 |
-05:01:41.9 |
HIP 79681 |
8.48 |
| 2026-08-03 00:00 |
16:15:49.31 |
-05:05:02.5 |
HIP 79681 |
11.28 |
| 2026-08-03 12:00 |
16:16:07.47 |
-05:08:23.6 |
HIP 79681 |
15.67 |
| 2026-08-04 00:00 |
16:16:25.94 |
-05:11:45.3 |
HIP 79768 |
18.89 |
| 2026-08-04 12:00 |
16:16:44.71 |
-05:15:07.5 |
HIP 79768 |
14.71 |
| 2026-08-05 00:00 |
16:17:03.77 |
-05:18:30.1 |
HIP 79768 |
11.94 |
| 2026-08-05 12:00 |
16:17:23.13 |
-05:21:53.2 |
HIP 79768 |
11.74 |
| 2026-08-06 00:00 |
16:17:42.78 |
-05:25:16.7 |
HIP 79768 |
14.30 |
| 2026-08-06 12:00 |
16:18:02.73 |
-05:28:40.7 |
HIP 79768 |
18.56 |
| 2026-08-07 00:00 |
16:18:22.96 |
-05:32:05.0 |
HIP 79768 |
23.67 |
| 2026-08-07 12:00 |
16:18:43.49 |
-05:35:29.7 |
HIP 79924 |
24.18 |
| 2026-08-08 00:00 |
16:19:04.30 |
-05:38:54.7 |
HIP 79924 |
21.11 |
| 2026-08-08 12:00 |
16:19:25.41 |
-05:42:20.1 |
HIP 79924 |
19.60 |
| 2026-08-09 00:00 |
16:19:46.80 |
-05:45:45.7 |
HIP 79924 |
20.08 |
| 2026-08-09 12:00 |
16:20:08.47 |
-05:49:11.7 |
HIP 79924 |
22.47 |
| 2026-08-10 00:00 |
16:20:30.42 |
-05:52:37.8 |
HIP 79924 |
26.31 |
| 2026-08-10 12:00 |
16:20:52.66 |
-05:56:04.3 |
HIP 80191 |
26.02 |
| 2026-08-11 00:00 |
16:21:15.18 |
-05:59:30.9 |
HIP 80191 |
24.30 |
| 2026-08-11 12:00 |
16:21:37.97 |
-06:02:57.7 |
HIP 80191 |
24.28 |
| 2026-08-12 00:00 |
16:22:01.04 |
-06:06:24.7 |
HIP 80191 |
26.00 |
| 2026-08-12 12:00 |
16:22:24.39 |
-06:09:51.8 |
HIP 80191 |
29.20 |
| 2026-08-13 00:00 |
16:22:48.01 |
-06:13:19.1 |
HIP 80191 |
33.49 |
| 2026-08-13 12:00 |
16:23:11.90 |
-06:16:46.5 |
HIP 80402 |
27.20 |
| 2026-08-14 00:00 |
16:23:36.06 |
-06:20:13.9 |
HIP 80402 |
20.31 |
| 2026-08-14 12:00 |
16:24:00.49 |
-06:23:41.4 |
HIP 80402 |
13.42 |
| 2026-08-15 00:00 |
16:24:25.18 |
-06:27:08.9 |
HIP 80402 |
6.67 |
| 2026-08-15 12:00 |
16:24:50.14 |
-06:30:36.4 |
HIP 80402 |
2.91 |
| 2026-08-16 00:00 |
16:25:15.36 |
-06:34:04.0 |
HIP 80402 |
8.62 |
| 2026-08-16 12:00 |
16:25:40.84 |
-06:37:31.5 |
HIP 80402 |
15.64 |
| 2026-08-17 00:00 |
16:26:06.58 |
-06:40:58.9 |
HIP 80509 |
15.76 |
| 2026-08-17 12:00 |
16:26:32.57 |
-06:44:26.3 |
HIP 80509 |
13.99 |
| 2026-08-18 00:00 |
16:26:58.82 |
-06:47:53.6 |
HIP 80509 |
15.87 |
| 2026-08-18 12:00 |
16:27:25.33 |
-06:51:20.8 |
HIP 80509 |
20.47 |
| 2026-08-19 00:00 |
16:27:52.08 |
-06:54:47.8 |
HIP 80509 |
26.46 |