メタデータ
| 項目 |
値 |
| Designation |
415P/Tenagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-02-16T03:55:08.005440Z |
| Orbit solution date (soln_date, UTC) |
2025-04-09T14:05:50Z |
| Obs used |
199 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
19.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-25T13:33:49.824000Z |
| Discovery magnitude (MPC) |
21.10 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-11-04.0000000 |
| e |
0.19516380 |
| q (au) |
3.311953 |
| a (au) |
4.115065 |
| i (deg) |
31.789340 |
| Ω (om, deg) |
160.325572 |
| ω (w, deg) |
346.450161 |
| M (ma, deg) |
261.392377 |
等級
散乱 + 全体線形
$$
M_a = (10.505 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.505 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.732 |
| k |
0.964 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:50:47.18 |
-07:50:30.9 |
HIP 117439 |
35.10 |
| 2026-03-26 12:00 |
23:51:14.79 |
-07:48:49.5 |
HIP 117439 |
41.88 |
| 2026-03-27 00:00 |
23:51:42.40 |
-07:47:08.3 |
HIP 117446 |
48.36 |
| 2026-03-27 12:00 |
23:52:10.00 |
-07:45:27.4 |
HIP 117446 |
53.85 |
| 2026-03-28 00:00 |
23:52:37.59 |
-07:43:46.8 |
HIP 117924 |
56.49 |
| 2026-03-28 12:00 |
23:53:05.16 |
-07:42:06.6 |
HIP 117924 |
53.65 |
| 2026-03-29 00:00 |
23:53:32.73 |
-07:40:26.6 |
HIP 117924 |
51.62 |
| 2026-03-29 12:00 |
23:54:00.28 |
-07:38:46.9 |
HIP 118064 |
48.20 |
| 2026-03-30 00:00 |
23:54:27.82 |
-07:37:07.6 |
HIP 118064 |
41.25 |
| 2026-03-30 12:00 |
23:54:55.35 |
-07:35:28.6 |
HIP 118064 |
34.33 |
| 2026-03-31 00:00 |
23:55:22.86 |
-07:33:49.9 |
HIP 118064 |
27.48 |
| 2026-03-31 12:00 |
23:55:50.36 |
-07:32:11.6 |
HIP 118064 |
20.74 |
| 2026-04-01 00:00 |
23:56:17.84 |
-07:30:33.6 |
HIP 118064 |
14.26 |
| 2026-04-01 12:00 |
23:56:45.31 |
-07:28:56.0 |
HIP 118064 |
8.66 |
| 2026-04-02 00:00 |
23:57:12.76 |
-07:27:18.7 |
HIP 118064 |
6.68 |
| 2026-04-02 12:00 |
23:57:40.20 |
-07:25:41.8 |
HIP 118132 |
3.49 |
| 2026-04-03 00:00 |
23:58:07.63 |
-07:24:05.2 |
HIP 118132 |
5.60 |
| 2026-04-03 12:00 |
23:58:35.03 |
-07:22:29.0 |
HIP 118132 |
12.17 |
| 2026-04-04 00:00 |
23:59:02.42 |
-07:20:53.2 |
HIP 118132 |
19.03 |
| 2026-04-04 12:00 |
23:59:29.79 |
-07:19:17.8 |
HIP 118132 |
25.95 |
| 2026-04-05 00:00 |
23:59:57.14 |
-07:17:42.7 |
HIP 118294 |
31.40 |
| 2026-04-05 12:00 |
00:00:24.48 |
-07:16:08.1 |
HIP 118294 |
34.72 |
| 2026-04-06 00:00 |
00:00:51.79 |
-07:14:33.8 |
HIP 118294 |
39.01 |
| 2026-04-06 12:00 |
00:01:19.09 |
-07:13:00.0 |
HIP 118294 |
43.98 |
| 2026-04-07 00:00 |
00:01:46.37 |
-07:11:26.5 |
HIP 245 |
42.06 |
| 2026-04-07 12:00 |
00:02:13.62 |
-07:09:53.5 |
HIP 356 |
35.93 |
| 2026-04-08 00:00 |
00:02:40.86 |
-07:08:20.9 |
HIP 356 |
29.06 |
| 2026-04-08 12:00 |
00:03:08.07 |
-07:06:48.8 |
HIP 356 |
22.23 |
| 2026-04-09 00:00 |
00:03:35.26 |
-07:05:17.0 |
HIP 356 |
15.49 |
| 2026-04-09 12:00 |
00:04:02.43 |
-07:03:45.8 |
HIP 356 |
9.03 |
| 2026-04-10 00:00 |
00:04:29.58 |
-07:02:14.9 |
HIP 356 |
4.33 |
| 2026-04-10 12:00 |
00:04:56.70 |
-07:00:44.6 |
HIP 356 |
7.16 |
| 2026-04-11 00:00 |
00:05:23.80 |
-06:59:14.7 |
HIP 356 |
13.38 |
| 2026-04-11 12:00 |
00:05:50.88 |
-06:57:45.2 |
HIP 356 |
20.03 |
| 2026-04-12 00:00 |
00:06:17.93 |
-06:56:16.3 |
HIP 356 |
26.79 |
| 2026-04-12 12:00 |
00:06:44.95 |
-06:54:47.8 |
HIP 692 |
27.27 |
| 2026-04-13 00:00 |
00:07:11.95 |
-06:53:19.8 |
HIP 692 |
20.43 |
| 2026-04-13 12:00 |
00:07:38.92 |
-06:51:52.3 |
HIP 692 |
13.61 |
| 2026-04-14 00:00 |
00:08:05.87 |
-06:50:25.3 |
HIP 692 |
6.85 |
| 2026-04-14 12:00 |
00:08:32.78 |
-06:48:58.9 |
HIP 692 |
1.53 |
| 2026-04-15 00:00 |
00:08:59.67 |
-06:47:32.9 |
HIP 692 |
7.15 |
| 2026-04-15 12:00 |
00:09:26.53 |
-06:46:07.5 |
HIP 792 |
7.00 |
| 2026-04-16 00:00 |
00:09:53.35 |
-06:44:42.6 |
HIP 792 |
5.88 |