C/2015 D1 (SOHO)
メタデータ
| 項目 |
値 |
| Designation |
C/2015 D1 (SOHO) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-02-19T17:57:35.902080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-16T12:05:35Z |
| Obs used |
417 |
| NEO |
Yes |
| M1 |
10.000 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-02-20.0000000 |
| e |
0.99432307 |
| q (au) |
0.028322 |
| a (au) |
4.989017 |
| i (deg) |
69.615618 |
| Ω (om, deg) |
95.881026 |
| ω (w, deg) |
234.955413 |
| M (ma, deg) |
0.022259 |
等級
散乱 + 全体線形
$$
M_a = (10.588 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.588 |
| n |
2.000 |
| 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 |
| 2015-02-18 |
2015-02-19 |
+1.3163 |
+2.292 |
| 2015-02-19 |
2015-02-20 |
+4.4218 |
+6.644 |
| 2015-02-20 |
2015-03-17 |
-1.4381 |
-2.010 |
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) |
| 2026-02-03 00:00 |
09:16:59.14 |
+65:18:00.7 |
HIP 45616 |
11.19 |
| 2026-02-03 12:00 |
09:16:51.42 |
+65:18:12.6 |
HIP 45616 |
11.44 |
| 2026-02-04 00:00 |
09:16:43.69 |
+65:18:24.2 |
HIP 45616 |
11.76 |
| 2026-02-04 12:00 |
09:16:35.96 |
+65:18:35.4 |
HIP 45616 |
12.13 |
| 2026-02-05 00:00 |
09:16:28.23 |
+65:18:46.2 |
HIP 45616 |
12.54 |
| 2026-02-05 12:00 |
09:16:20.50 |
+65:18:56.6 |
HIP 45616 |
13.00 |
| 2026-02-06 00:00 |
09:16:12.77 |
+65:19:06.7 |
HIP 45616 |
13.50 |
| 2026-02-06 12:00 |
09:16:05.04 |
+65:19:16.5 |
HIP 45616 |
14.03 |
| 2026-02-07 00:00 |
09:15:57.31 |
+65:19:25.8 |
HIP 45616 |
14.60 |
| 2026-02-07 12:00 |
09:15:49.58 |
+65:19:34.8 |
HIP 45616 |
15.18 |
| 2026-02-08 00:00 |
09:15:41.86 |
+65:19:43.5 |
HIP 45616 |
15.80 |
| 2026-02-08 12:00 |
09:15:34.14 |
+65:19:51.7 |
HIP 45616 |
16.43 |
| 2026-02-09 00:00 |
09:15:26.42 |
+65:19:59.6 |
HIP 45616 |
17.08 |
| 2026-02-09 12:00 |
09:15:18.71 |
+65:20:07.1 |
HIP 45616 |
17.74 |
| 2026-02-10 00:00 |
09:15:11.01 |
+65:20:14.3 |
HIP 45616 |
18.42 |
| 2026-02-10 12:00 |
09:15:03.31 |
+65:20:21.1 |
HIP 45616 |
19.11 |
| 2026-02-11 00:00 |
09:14:55.62 |
+65:20:27.5 |
HIP 45616 |
19.81 |
| 2026-02-11 12:00 |
09:14:47.94 |
+65:20:33.5 |
HIP 45616 |
20.52 |
| 2026-02-12 00:00 |
09:14:40.26 |
+65:20:39.2 |
HIP 45616 |
21.24 |
| 2026-02-12 12:00 |
09:14:32.60 |
+65:20:44.5 |
HIP 45616 |
21.97 |
| 2026-02-13 00:00 |
09:14:24.94 |
+65:20:49.5 |
HIP 45616 |
22.70 |
| 2026-02-13 12:00 |
09:14:17.30 |
+65:20:54.0 |
HIP 45246 |
23.07 |
| 2026-02-14 00:00 |
09:14:09.67 |
+65:20:58.2 |
HIP 45246 |
22.82 |
| 2026-02-14 12:00 |
09:14:02.05 |
+65:21:02.0 |
HIP 45246 |
22.60 |
| 2026-02-15 00:00 |
09:13:54.44 |
+65:21:05.5 |
HIP 45246 |
22.41 |
| 2026-02-15 12:00 |
09:13:46.85 |
+65:21:08.5 |
HIP 45246 |
22.25 |
| 2026-02-16 00:00 |
09:13:39.27 |
+65:21:11.2 |
HIP 45246 |
22.12 |
| 2026-02-16 12:00 |
09:13:31.71 |
+65:21:13.6 |
HIP 45246 |
22.03 |
| 2026-02-17 00:00 |
09:13:24.16 |
+65:21:15.5 |
HIP 45246 |
21.97 |
| 2026-02-17 12:00 |
09:13:16.63 |
+65:21:17.1 |
HIP 45246 |
21.95 |
| 2026-02-18 00:00 |
09:13:09.12 |
+65:21:18.3 |
HIP 45246 |
21.96 |
| 2026-02-18 12:00 |
09:13:01.62 |
+65:21:19.1 |
HIP 45246 |
22.00 |
| 2026-02-19 00:00 |
09:12:54.15 |
+65:21:19.6 |
HIP 45246 |
22.08 |
| 2026-02-19 12:00 |
09:12:46.69 |
+65:21:19.7 |
HIP 45246 |
22.19 |
| 2026-02-20 00:00 |
09:12:39.25 |
+65:21:19.4 |
HIP 45246 |
22.33 |
| 2026-02-20 12:00 |
09:12:31.84 |
+65:21:18.8 |
HIP 45246 |
22.50 |
| 2026-02-21 00:00 |
09:12:24.44 |
+65:21:17.8 |
HIP 44903 |
22.04 |
| 2026-02-21 12:00 |
09:12:17.07 |
+65:21:16.4 |
HIP 44903 |
21.27 |
| 2026-02-22 00:00 |
09:12:09.72 |
+65:21:14.7 |
HIP 44903 |
20.51 |
| 2026-02-22 12:00 |
09:12:02.40 |
+65:21:12.6 |
HIP 44903 |
19.75 |
| 2026-02-23 00:00 |
09:11:55.10 |
+65:21:10.1 |
HIP 44903 |
18.99 |
| 2026-02-23 12:00 |
09:11:47.83 |
+65:21:07.3 |
HIP 44903 |
18.24 |
| 2026-02-24 00:00 |
09:11:40.58 |
+65:21:04.1 |
HIP 44903 |
17.49 |