メタデータ
| 項目 |
値 |
| Designation |
C/1954 O2 (Baade) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1955-08-13T07:51:21.994560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
35 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1955-09-19.0000000 |
| e |
1.00055852 |
| q (au) |
3.869944 |
| a (au) |
-6928.925768 |
| i (deg) |
100.387736 |
| Ω (om, deg) |
265.340699 |
| ω (w, deg) |
144.674890 |
| M (ma, deg) |
0.000063 |
等級
散乱 + 全体線形
$$
M_a = (-0.462 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.462 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1955-09-09 |
1957-11-02 |
+4.8428 |
-3.023 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
20:16:53.48 |
-79:40:13.7 |
HIP 100416 |
13.74 |
| 2026-09-20 12:00 |
20:16:49.46 |
-79:40:00.7 |
HIP 100416 |
13.85 |
| 2026-09-21 00:00 |
20:16:45.49 |
-79:39:47.7 |
HIP 100416 |
13.96 |
| 2026-09-21 12:00 |
20:16:41.58 |
-79:39:34.6 |
HIP 100416 |
14.07 |
| 2026-09-22 00:00 |
20:16:37.72 |
-79:39:21.4 |
HIP 100416 |
14.19 |
| 2026-09-22 12:00 |
20:16:33.91 |
-79:39:08.0 |
HIP 100416 |
14.30 |
| 2026-09-23 00:00 |
20:16:30.15 |
-79:38:54.6 |
HIP 100416 |
14.42 |
| 2026-09-23 12:00 |
20:16:26.45 |
-79:38:41.1 |
HIP 100416 |
14.54 |
| 2026-09-24 00:00 |
20:16:22.79 |
-79:38:27.6 |
HIP 100416 |
14.66 |
| 2026-09-24 12:00 |
20:16:19.20 |
-79:38:13.9 |
HIP 100416 |
14.79 |
| 2026-09-25 00:00 |
20:16:15.65 |
-79:38:00.1 |
HIP 100416 |
14.91 |
| 2026-09-25 12:00 |
20:16:12.17 |
-79:37:46.3 |
HIP 100416 |
15.04 |
| 2026-09-26 00:00 |
20:16:08.73 |
-79:37:32.3 |
HIP 100416 |
15.17 |
| 2026-09-26 12:00 |
20:16:05.35 |
-79:37:18.3 |
HIP 100416 |
15.30 |
| 2026-09-27 00:00 |
20:16:02.02 |
-79:37:04.2 |
HIP 100416 |
15.43 |
| 2026-09-27 12:00 |
20:15:58.75 |
-79:36:50.0 |
HIP 100416 |
15.56 |
| 2026-09-28 00:00 |
20:15:55.54 |
-79:36:35.7 |
HIP 100416 |
15.70 |
| 2026-09-28 12:00 |
20:15:52.38 |
-79:36:21.4 |
HIP 100416 |
15.84 |
| 2026-09-29 00:00 |
20:15:49.27 |
-79:36:06.9 |
HIP 100416 |
15.97 |
| 2026-09-29 12:00 |
20:15:46.22 |
-79:35:52.4 |
HIP 100416 |
16.11 |
| 2026-09-30 00:00 |
20:15:43.22 |
-79:35:37.8 |
HIP 100416 |
16.25 |
| 2026-09-30 12:00 |
20:15:40.28 |
-79:35:23.2 |
HIP 100416 |
16.39 |
| 2026-10-01 00:00 |
20:15:37.40 |
-79:35:08.4 |
HIP 100416 |
16.54 |
| 2026-10-01 12:00 |
20:15:34.57 |
-79:34:53.6 |
HIP 100416 |
16.68 |
| 2026-10-02 00:00 |
20:15:31.80 |
-79:34:38.7 |
HIP 100416 |
16.82 |
| 2026-10-02 12:00 |
20:15:29.09 |
-79:34:23.7 |
HIP 100416 |
16.97 |
| 2026-10-03 00:00 |
20:15:26.43 |
-79:34:08.7 |
HIP 100416 |
17.11 |
| 2026-10-03 12:00 |
20:15:23.83 |
-79:33:53.6 |
HIP 100416 |
17.26 |
| 2026-10-04 00:00 |
20:15:21.29 |
-79:33:38.4 |
HIP 100416 |
17.41 |
| 2026-10-04 12:00 |
20:15:18.81 |
-79:33:23.2 |
HIP 100416 |
17.56 |
| 2026-10-05 00:00 |
20:15:16.38 |
-79:33:07.8 |
HIP 100416 |
17.71 |
| 2026-10-05 12:00 |
20:15:14.01 |
-79:32:52.5 |
HIP 100416 |
17.86 |
| 2026-10-06 00:00 |
20:15:11.69 |
-79:32:37.0 |
HIP 100416 |
18.01 |
| 2026-10-06 12:00 |
20:15:09.44 |
-79:32:21.5 |
HIP 100416 |
18.16 |
| 2026-10-07 00:00 |
20:15:07.24 |
-79:32:05.9 |
HIP 100416 |
18.31 |
| 2026-10-07 12:00 |
20:15:05.10 |
-79:31:50.3 |
HIP 100416 |
18.47 |
| 2026-10-08 00:00 |
20:15:03.02 |
-79:31:34.6 |
HIP 100416 |
18.62 |
| 2026-10-08 12:00 |
20:15:01.00 |
-79:31:18.8 |
HIP 100416 |
18.78 |
| 2026-10-09 00:00 |
20:14:59.04 |
-79:31:03.0 |
HIP 100416 |
18.93 |
| 2026-10-09 12:00 |
20:14:57.14 |
-79:30:47.2 |
HIP 100416 |
19.09 |
| 2026-10-10 00:00 |
20:14:55.29 |
-79:30:31.2 |
HIP 100416 |
19.24 |
| 2026-10-10 12:00 |
20:14:53.51 |
-79:30:15.3 |
HIP 100416 |
19.40 |
| 2026-10-11 00:00 |
20:14:51.78 |
-79:29:59.2 |
HIP 100416 |
19.56 |