메타데이터
| 항목 |
값 |
| Designation |
C/1975 V2 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-12-21T04:20:57.010560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
16.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1975-12-22.0000000 |
| e |
1.00001538 |
| q (au) |
0.218721 |
| a (au) |
-14217.185675 |
| i (deg) |
70.626160 |
| Ω (om, deg) |
271.312759 |
| ω (w, deg) |
358.089866 |
| M (ma, deg) |
0.000000 |
밝기
산란 + 전체 선형
$$
M_a = (9.332 + 3.967\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.332 |
| n |
3.967 |
| gf |
0.800 |
| gb |
-0.640 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
05:55:24.56 |
+30:48:02.1 |
HIP 28022 |
5.95 |
| 2026-07-29 12:00 |
05:55:25.97 |
+30:48:03.9 |
HIP 28022 |
5.85 |
| 2026-07-30 00:00 |
05:55:27.37 |
+30:48:05.6 |
HIP 28022 |
5.77 |
| 2026-07-30 12:00 |
05:55:28.76 |
+30:48:07.4 |
HIP 28022 |
5.70 |
| 2026-07-31 00:00 |
05:55:30.14 |
+30:48:09.1 |
HIP 28022 |
5.64 |
| 2026-07-31 12:00 |
05:55:31.51 |
+30:48:10.9 |
HIP 28022 |
5.61 |
| 2026-08-01 00:00 |
05:55:32.88 |
+30:48:12.7 |
HIP 28022 |
5.59 |
| 2026-08-01 12:00 |
05:55:34.23 |
+30:48:14.6 |
HIP 28022 |
5.58 |
| 2026-08-02 00:00 |
05:55:35.58 |
+30:48:16.4 |
HIP 28022 |
5.59 |
| 2026-08-02 12:00 |
05:55:36.91 |
+30:48:18.3 |
HIP 28022 |
5.62 |
| 2026-08-03 00:00 |
05:55:38.24 |
+30:48:20.2 |
HIP 28022 |
5.66 |
| 2026-08-03 12:00 |
05:55:39.55 |
+30:48:22.0 |
HIP 28022 |
5.72 |
| 2026-08-04 00:00 |
05:55:40.86 |
+30:48:24.0 |
HIP 28022 |
5.79 |
| 2026-08-04 12:00 |
05:55:42.15 |
+30:48:25.9 |
HIP 28022 |
5.87 |
| 2026-08-05 00:00 |
05:55:43.44 |
+30:48:27.8 |
HIP 28022 |
5.96 |
| 2026-08-05 12:00 |
05:55:44.72 |
+30:48:29.8 |
HIP 28022 |
6.07 |
| 2026-08-06 00:00 |
05:55:45.98 |
+30:48:31.8 |
HIP 28022 |
6.18 |
| 2026-08-06 12:00 |
05:55:47.24 |
+30:48:33.8 |
HIP 28022 |
6.30 |
| 2026-08-07 00:00 |
05:55:48.49 |
+30:48:35.8 |
HIP 28022 |
6.44 |
| 2026-08-07 12:00 |
05:55:49.72 |
+30:48:37.8 |
HIP 28022 |
6.58 |
| 2026-08-08 00:00 |
05:55:50.95 |
+30:48:39.9 |
HIP 28022 |
6.72 |
| 2026-08-08 12:00 |
05:55:52.16 |
+30:48:41.9 |
HIP 28022 |
6.88 |
| 2026-08-09 00:00 |
05:55:53.36 |
+30:48:44.0 |
HIP 28022 |
7.04 |
| 2026-08-09 12:00 |
05:55:54.56 |
+30:48:46.1 |
HIP 28022 |
7.20 |
| 2026-08-10 00:00 |
05:55:55.74 |
+30:48:48.2 |
HIP 28022 |
7.37 |
| 2026-08-10 12:00 |
05:55:56.91 |
+30:48:50.3 |
HIP 28022 |
7.54 |
| 2026-08-11 00:00 |
05:55:58.07 |
+30:48:52.5 |
HIP 28022 |
7.71 |
| 2026-08-11 12:00 |
05:55:59.22 |
+30:48:54.6 |
HIP 28022 |
7.89 |
| 2026-08-12 00:00 |
05:56:00.35 |
+30:48:56.8 |
HIP 28022 |
8.07 |
| 2026-08-12 12:00 |
05:56:01.48 |
+30:48:59.0 |
HIP 28022 |
8.25 |
| 2026-08-13 00:00 |
05:56:02.59 |
+30:49:01.2 |
HIP 28022 |
8.44 |
| 2026-08-13 12:00 |
05:56:03.70 |
+30:49:03.4 |
HIP 28022 |
8.62 |
| 2026-08-14 00:00 |
05:56:04.79 |
+30:49:05.6 |
HIP 28022 |
8.81 |
| 2026-08-14 12:00 |
05:56:05.87 |
+30:49:07.8 |
HIP 28022 |
9.00 |
| 2026-08-15 00:00 |
05:56:06.93 |
+30:49:10.1 |
HIP 28022 |
9.19 |
| 2026-08-15 12:00 |
05:56:07.99 |
+30:49:12.4 |
HIP 28022 |
9.37 |
| 2026-08-16 00:00 |
05:56:09.03 |
+30:49:14.6 |
HIP 28022 |
9.56 |
| 2026-08-16 12:00 |
05:56:10.06 |
+30:49:16.9 |
HIP 28022 |
9.75 |
| 2026-08-17 00:00 |
05:56:11.08 |
+30:49:19.2 |
HIP 28022 |
9.94 |
| 2026-08-17 12:00 |
05:56:12.09 |
+30:49:21.6 |
HIP 28022 |
10.13 |
| 2026-08-18 00:00 |
05:56:13.09 |
+30:49:23.9 |
HIP 28022 |
10.31 |
| 2026-08-18 12:00 |
05:56:14.07 |
+30:49:26.2 |
HIP 28022 |
10.50 |
| 2026-08-19 00:00 |
05:56:15.04 |
+30:49:28.6 |
HIP 28022 |
10.69 |