메타데이터
| 항목 |
값 |
| Designation |
C/1995 Q1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1995-08-31T10:02:38.832000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
156 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
16.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1995-10-23.0000000 |
| e |
0.99802567 |
| q (au) |
0.436387 |
| a (au) |
221.030541 |
| i (deg) |
147.394301 |
| Ω (om, deg) |
178.054729 |
| ω (w, deg) |
331.161810 |
| M (ma, deg) |
0.015771 |
밝기
산란 + 전체 선형
$$
M_a = (7.436 + 4.304\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.436 |
| n |
4.304 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 1995-08-18 |
1995-08-30 |
-1.3532 |
+0.497 |
| 1995-09-23 |
1995-10-08 |
-3.7552 |
-0.310 |
| 1995-10-08 |
1995-10-17 |
+7.6437 |
-0.177 |
| 1995-10-17 |
1995-11-21 |
+1.5080 |
-0.252 |
| 1995-11-21 |
1995-12-13 |
+13.9429 |
-3.253 |
| 1995-12-13 |
1996-02-19 |
+6.5452 |
-1.275 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
01:31:27.46 |
+30:24:38.9 |
HIP 7123 |
13.49 |
| 2026-06-01 12:00 |
01:31:29.06 |
+30:24:54.5 |
HIP 7123 |
13.14 |
| 2026-06-02 00:00 |
01:31:30.66 |
+30:25:10.1 |
HIP 7123 |
12.79 |
| 2026-06-02 12:00 |
01:31:32.24 |
+30:25:25.7 |
HIP 7123 |
12.45 |
| 2026-06-03 00:00 |
01:31:33.81 |
+30:25:41.3 |
HIP 7123 |
12.12 |
| 2026-06-03 12:00 |
01:31:35.36 |
+30:25:56.9 |
HIP 7123 |
11.80 |
| 2026-06-04 00:00 |
01:31:36.90 |
+30:26:12.5 |
HIP 7123 |
11.48 |
| 2026-06-04 12:00 |
01:31:38.43 |
+30:26:28.0 |
HIP 7123 |
11.16 |
| 2026-06-05 00:00 |
01:31:39.94 |
+30:26:43.6 |
HIP 7123 |
10.86 |
| 2026-06-05 12:00 |
01:31:41.43 |
+30:26:59.2 |
HIP 7123 |
10.56 |
| 2026-06-06 00:00 |
01:31:42.91 |
+30:27:14.8 |
HIP 7123 |
10.28 |
| 2026-06-06 12:00 |
01:31:44.38 |
+30:27:30.3 |
HIP 7123 |
10.00 |
| 2026-06-07 00:00 |
01:31:45.83 |
+30:27:45.9 |
HIP 7123 |
9.73 |
| 2026-06-07 12:00 |
01:31:47.27 |
+30:28:01.4 |
HIP 7123 |
9.47 |
| 2026-06-08 00:00 |
01:31:48.69 |
+30:28:16.9 |
HIP 7123 |
9.22 |
| 2026-06-08 12:00 |
01:31:50.09 |
+30:28:32.4 |
HIP 7123 |
8.98 |
| 2026-06-09 00:00 |
01:31:51.48 |
+30:28:47.9 |
HIP 7123 |
8.75 |
| 2026-06-09 12:00 |
01:31:52.86 |
+30:29:03.4 |
HIP 7123 |
8.54 |
| 2026-06-10 00:00 |
01:31:54.22 |
+30:29:18.9 |
HIP 7123 |
8.34 |
| 2026-06-10 12:00 |
01:31:55.56 |
+30:29:34.4 |
HIP 7123 |
8.15 |
| 2026-06-11 00:00 |
01:31:56.89 |
+30:29:49.8 |
HIP 7123 |
7.97 |
| 2026-06-11 12:00 |
01:31:58.20 |
+30:30:05.2 |
HIP 7123 |
7.81 |
| 2026-06-12 00:00 |
01:31:59.50 |
+30:30:20.6 |
HIP 7123 |
7.67 |
| 2026-06-12 12:00 |
01:32:00.78 |
+30:30:36.0 |
HIP 7123 |
7.53 |
| 2026-06-13 00:00 |
01:32:02.04 |
+30:30:51.4 |
HIP 7123 |
7.42 |
| 2026-06-13 12:00 |
01:32:03.29 |
+30:31:06.7 |
HIP 7123 |
7.32 |
| 2026-06-14 00:00 |
01:32:04.52 |
+30:31:22.0 |
HIP 7123 |
7.24 |
| 2026-06-14 12:00 |
01:32:05.74 |
+30:31:37.3 |
HIP 7123 |
7.17 |
| 2026-06-15 00:00 |
01:32:06.94 |
+30:31:52.6 |
HIP 7123 |
7.12 |
| 2026-06-15 12:00 |
01:32:08.12 |
+30:32:07.8 |
HIP 7123 |
7.08 |
| 2026-06-16 00:00 |
01:32:09.28 |
+30:32:23.0 |
HIP 7123 |
7.06 |
| 2026-06-16 12:00 |
01:32:10.43 |
+30:32:38.2 |
HIP 7123 |
7.06 |
| 2026-06-17 00:00 |
01:32:11.56 |
+30:32:53.3 |
HIP 7123 |
7.07 |
| 2026-06-17 12:00 |
01:32:12.68 |
+30:33:08.4 |
HIP 7123 |
7.10 |
| 2026-06-18 00:00 |
01:32:13.77 |
+30:33:23.5 |
HIP 7123 |
7.14 |
| 2026-06-18 12:00 |
01:32:14.85 |
+30:33:38.5 |
HIP 7123 |
7.19 |
| 2026-06-19 00:00 |
01:32:15.91 |
+30:33:53.6 |
HIP 7123 |
7.26 |
| 2026-06-19 12:00 |
01:32:16.96 |
+30:34:08.5 |
HIP 7123 |
7.34 |
| 2026-06-20 00:00 |
01:32:17.99 |
+30:34:23.5 |
HIP 7123 |
7.43 |
| 2026-06-20 12:00 |
01:32:19.00 |
+30:34:38.3 |
HIP 7123 |
7.53 |
| 2026-06-21 00:00 |
01:32:19.99 |
+30:34:53.2 |
HIP 7123 |
7.64 |
| 2026-06-21 12:00 |
01:32:20.96 |
+30:35:08.0 |
HIP 7123 |
7.76 |
| 2026-06-22 00:00 |
01:32:21.92 |
+30:35:22.8 |
HIP 7123 |
7.88 |