메타데이터
| 항목 |
값 |
| Designation |
C/1975 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-04-04T13:55:24.000960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1975-06-11.0000000 |
| e |
1.00140639 |
| q (au) |
1.216946 |
| a (au) |
-865.298894 |
| i (deg) |
55.243879 |
| Ω (om, deg) |
157.908852 |
| ω (w, deg) |
264.130708 |
| M (ma, deg) |
0.002611 |
밝기
산란 + 전체 선형
$$
M_a = (10.105 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.105 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.804 |
| 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) |
| 2026-05-12 00:00 |
15:22:04.52 |
+34:45:16.1 |
HIP 75326 |
18.11 |
| 2026-05-12 12:00 |
15:22:02.75 |
+34:45:20.4 |
HIP 75326 |
18.42 |
| 2026-05-13 00:00 |
15:22:00.97 |
+34:45:24.6 |
HIP 75326 |
18.73 |
| 2026-05-13 12:00 |
15:21:59.20 |
+34:45:28.5 |
HIP 75326 |
19.05 |
| 2026-05-14 00:00 |
15:21:57.43 |
+34:45:32.3 |
HIP 75326 |
19.37 |
| 2026-05-14 12:00 |
15:21:55.66 |
+34:45:36.0 |
HIP 75326 |
19.69 |
| 2026-05-15 00:00 |
15:21:53.88 |
+34:45:39.5 |
HIP 75326 |
20.01 |
| 2026-05-15 12:00 |
15:21:52.11 |
+34:45:42.8 |
HIP 75326 |
20.34 |
| 2026-05-16 00:00 |
15:21:50.34 |
+34:45:46.0 |
HIP 75326 |
20.67 |
| 2026-05-16 12:00 |
15:21:48.57 |
+34:45:49.0 |
HIP 75326 |
21.00 |
| 2026-05-17 00:00 |
15:21:46.80 |
+34:45:51.8 |
HIP 75326 |
21.33 |
| 2026-05-17 12:00 |
15:21:45.03 |
+34:45:54.5 |
HIP 75326 |
21.66 |
| 2026-05-18 00:00 |
15:21:43.26 |
+34:45:57.0 |
HIP 75326 |
22.00 |
| 2026-05-18 12:00 |
15:21:41.49 |
+34:45:59.4 |
HIP 75326 |
22.34 |
| 2026-05-19 00:00 |
15:21:39.73 |
+34:46:01.6 |
HIP 75326 |
22.68 |
| 2026-05-19 12:00 |
15:21:37.96 |
+34:46:03.6 |
HIP 75326 |
23.02 |
| 2026-05-20 00:00 |
15:21:36.20 |
+34:46:05.5 |
HIP 75326 |
23.36 |
| 2026-05-20 12:00 |
15:21:34.44 |
+34:46:07.2 |
HIP 75326 |
23.70 |
| 2026-05-21 00:00 |
15:21:32.68 |
+34:46:08.8 |
HIP 75326 |
24.04 |
| 2026-05-21 12:00 |
15:21:30.93 |
+34:46:10.1 |
HIP 75326 |
24.38 |
| 2026-05-22 00:00 |
15:21:29.17 |
+34:46:11.4 |
HIP 75326 |
24.73 |
| 2026-05-22 12:00 |
15:21:27.42 |
+34:46:12.4 |
HIP 75326 |
25.07 |
| 2026-05-23 00:00 |
15:21:25.67 |
+34:46:13.4 |
HIP 75326 |
25.42 |
| 2026-05-23 12:00 |
15:21:23.92 |
+34:46:14.1 |
HIP 75326 |
25.76 |
| 2026-05-24 00:00 |
15:21:22.18 |
+34:46:14.7 |
HIP 75326 |
26.11 |
| 2026-05-24 12:00 |
15:21:20.44 |
+34:46:15.1 |
HIP 75326 |
26.46 |
| 2026-05-25 00:00 |
15:21:18.70 |
+34:46:15.4 |
HIP 75326 |
26.80 |
| 2026-05-25 12:00 |
15:21:16.96 |
+34:46:15.5 |
HIP 75326 |
27.15 |
| 2026-05-26 00:00 |
15:21:15.23 |
+34:46:15.4 |
HIP 75326 |
27.50 |
| 2026-05-26 12:00 |
15:21:13.50 |
+34:46:15.2 |
HIP 75326 |
27.85 |
| 2026-05-27 00:00 |
15:21:11.77 |
+34:46:14.8 |
HIP 75326 |
28.19 |
| 2026-05-27 12:00 |
15:21:10.05 |
+34:46:14.3 |
HIP 75326 |
28.54 |
| 2026-05-28 00:00 |
15:21:08.33 |
+34:46:13.6 |
HIP 75326 |
28.89 |
| 2026-05-28 12:00 |
15:21:06.62 |
+34:46:12.7 |
HIP 75326 |
29.24 |
| 2026-05-29 00:00 |
15:21:04.91 |
+34:46:11.7 |
HIP 75326 |
29.58 |
| 2026-05-29 12:00 |
15:21:03.20 |
+34:46:10.6 |
HIP 75326 |
29.93 |
| 2026-05-30 00:00 |
15:21:01.50 |
+34:46:09.2 |
HIP 75326 |
30.28 |
| 2026-05-30 12:00 |
15:20:59.80 |
+34:46:07.7 |
HIP 75326 |
30.62 |
| 2026-05-31 00:00 |
15:20:58.11 |
+34:46:06.1 |
HIP 75326 |
30.97 |
| 2026-05-31 12:00 |
15:20:56.42 |
+34:46:04.3 |
HIP 75326 |
31.32 |
| 2026-06-01 00:00 |
15:20:54.74 |
+34:46:02.3 |
HIP 75326 |
31.66 |
| 2026-06-01 12:00 |
15:20:53.06 |
+34:46:00.2 |
HIP 75326 |
32.01 |
| 2026-06-02 00:00 |
15:20:51.39 |
+34:45:57.9 |
HIP 75326 |
32.35 |