メタデータ
| 項目 |
値 |
| Designation |
274P/Tombaugh-Tenagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-02-23T13:58:11.107200Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:06Z |
| Obs used |
915 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
14.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-12-01.0000000 |
| e |
0.43970884 |
| q (au) |
2.445176 |
| a (au) |
4.364118 |
| i (deg) |
15.832722 |
| Ω (om, deg) |
81.368553 |
| ω (w, deg) |
38.590174 |
| M (ma, deg) |
109.234659 |
等級
散乱 + 全体線形
$$
M_a = (10.175 + 5.885\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.175 |
| n |
5.885 |
| gf |
1.000 |
| gb |
-0.893 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
19:42:07.90 |
-31:51:25.0 |
HIP 96964 |
23.67 |
| 2026-07-29 12:00 |
19:41:50.92 |
-31:52:12.1 |
HIP 96964 |
24.08 |
| 2026-07-30 00:00 |
19:41:33.98 |
-31:52:58.5 |
HIP 96819 |
22.18 |
| 2026-07-30 12:00 |
19:41:17.11 |
-31:53:44.0 |
HIP 96819 |
20.11 |
| 2026-07-31 00:00 |
19:41:00.29 |
-31:54:28.8 |
HIP 96819 |
18.56 |
| 2026-07-31 12:00 |
19:40:43.54 |
-31:55:12.8 |
HIP 96819 |
17.64 |
| 2026-08-01 00:00 |
19:40:26.85 |
-31:55:56.0 |
HIP 96819 |
17.45 |
| 2026-08-01 12:00 |
19:40:10.23 |
-31:56:38.5 |
HIP 96819 |
18.00 |
| 2026-08-02 00:00 |
19:39:53.68 |
-31:57:20.1 |
HIP 96819 |
19.22 |
| 2026-08-02 12:00 |
19:39:37.20 |
-31:58:01.0 |
HIP 96819 |
20.98 |
| 2026-08-03 00:00 |
19:39:20.79 |
-31:58:41.1 |
HIP 96819 |
23.16 |
| 2026-08-03 12:00 |
19:39:04.46 |
-31:59:20.4 |
HIP 96819 |
25.63 |
| 2026-08-04 00:00 |
19:38:48.21 |
-31:59:59.0 |
HIP 96819 |
28.31 |
| 2026-08-04 12:00 |
19:38:32.04 |
-32:00:36.7 |
HIP 96750 |
30.93 |
| 2026-08-05 00:00 |
19:38:15.95 |
-32:01:13.6 |
HIP 96460 |
32.08 |
| 2026-08-05 12:00 |
19:37:59.95 |
-32:01:49.8 |
HIP 96460 |
30.50 |
| 2026-08-06 00:00 |
19:37:44.03 |
-32:02:25.2 |
HIP 96460 |
29.24 |
| 2026-08-06 12:00 |
19:37:28.21 |
-32:02:59.7 |
HIP 96460 |
28.34 |
| 2026-08-07 00:00 |
19:37:12.47 |
-32:03:33.5 |
HIP 96460 |
27.82 |
| 2026-08-07 12:00 |
19:36:56.83 |
-32:04:06.5 |
HIP 96460 |
27.70 |
| 2026-08-08 00:00 |
19:36:41.29 |
-32:04:38.7 |
HIP 96460 |
27.98 |
| 2026-08-08 12:00 |
19:36:25.85 |
-32:05:10.1 |
HIP 96460 |
28.63 |
| 2026-08-09 00:00 |
19:36:10.50 |
-32:05:40.8 |
HIP 96460 |
29.62 |
| 2026-08-09 12:00 |
19:35:55.27 |
-32:06:10.6 |
HIP 96235 |
29.81 |
| 2026-08-10 00:00 |
19:35:40.13 |
-32:06:39.6 |
HIP 96235 |
27.14 |
| 2026-08-10 12:00 |
19:35:25.11 |
-32:07:07.9 |
HIP 96235 |
24.63 |
| 2026-08-11 00:00 |
19:35:10.19 |
-32:07:35.3 |
HIP 96235 |
22.32 |
| 2026-08-11 12:00 |
19:34:55.39 |
-32:08:02.0 |
HIP 96235 |
20.27 |
| 2026-08-12 00:00 |
19:34:40.71 |
-32:08:27.9 |
HIP 96235 |
18.56 |
| 2026-08-12 12:00 |
19:34:26.14 |
-32:08:53.0 |
HIP 96235 |
17.27 |
| 2026-08-13 00:00 |
19:34:11.69 |
-32:09:17.3 |
HIP 96235 |
16.49 |
| 2026-08-13 12:00 |
19:33:57.36 |
-32:09:40.8 |
HIP 96235 |
16.28 |
| 2026-08-14 00:00 |
19:33:43.15 |
-32:10:03.6 |
HIP 96235 |
16.63 |
| 2026-08-14 12:00 |
19:33:29.07 |
-32:10:25.5 |
HIP 96235 |
17.51 |
| 2026-08-15 00:00 |
19:33:15.11 |
-32:10:46.7 |
HIP 96235 |
18.82 |
| 2026-08-15 12:00 |
19:33:01.29 |
-32:11:07.1 |
HIP 96235 |
20.47 |
| 2026-08-16 00:00 |
19:32:47.60 |
-32:11:26.8 |
HIP 96235 |
22.38 |
| 2026-08-16 12:00 |
19:32:34.04 |
-32:11:45.6 |
HIP 96235 |
24.47 |
| 2026-08-17 00:00 |
19:32:20.61 |
-32:12:03.7 |
HIP 96235 |
26.69 |
| 2026-08-17 12:00 |
19:32:07.32 |
-32:12:21.1 |
HIP 95905 |
24.78 |
| 2026-08-18 00:00 |
19:31:54.17 |
-32:12:37.7 |
HIP 95905 |
22.21 |
| 2026-08-18 12:00 |
19:31:41.15 |
-32:12:53.5 |
HIP 95905 |
19.72 |
| 2026-08-19 00:00 |
19:31:28.28 |
-32:13:08.6 |
HIP 95905 |
17.33 |