메타데이터
| 항목 |
값 |
| Designation |
C/2008 T2 (Cardinal) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-06-13T05:44:59.979840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:24Z |
| Obs used |
1309 |
| NEO |
- |
| M1 |
11.200 |
| K1 |
5.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2009-02-08.0000000 |
| e |
1.00010902 |
| q (au) |
1.202208 |
| a (au) |
-11027.760878 |
| i (deg) |
56.303690 |
| Ω (om, deg) |
309.678521 |
| ω (w, deg) |
215.871148 |
| M (ma, deg) |
-0.000107 |
밝기
산란 + 전체 선형
$$
M_a = (12.536 + 3.857\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.536 |
| n |
3.857 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2008-03-20 |
2008-10-08 |
-32.2881 |
+17.516 |
| 2008-10-08 |
2009-04-10 |
+1.8402 |
-0.993 |
| 2009-04-10 |
2009-06-12 |
+22.8692 |
-5.412 |
| 2009-06-13 |
2009-10-10 |
+3.9717 |
-3.676 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
21:11:24.91 |
-03:39:41.6 |
HIP 104595 |
28.77 |
| 2026-03-26 12:00 |
21:11:26.99 |
-03:39:22.4 |
HIP 104595 |
29.13 |
| 2026-03-27 00:00 |
21:11:29.05 |
-03:39:03.1 |
HIP 104595 |
29.50 |
| 2026-03-27 12:00 |
21:11:31.09 |
-03:38:43.9 |
HIP 104595 |
29.88 |
| 2026-03-28 00:00 |
21:11:33.10 |
-03:38:24.7 |
HIP 104595 |
30.26 |
| 2026-03-28 12:00 |
21:11:35.10 |
-03:38:05.5 |
HIP 104595 |
30.65 |
| 2026-03-29 00:00 |
21:11:37.08 |
-03:37:46.4 |
HIP 104622 |
30.56 |
| 2026-03-29 12:00 |
21:11:39.03 |
-03:37:27.3 |
HIP 104622 |
30.25 |
| 2026-03-30 00:00 |
21:11:40.97 |
-03:37:08.3 |
HIP 104622 |
29.95 |
| 2026-03-30 12:00 |
21:11:42.88 |
-03:36:49.3 |
HIP 104622 |
29.65 |
| 2026-03-31 00:00 |
21:11:44.77 |
-03:36:30.3 |
HIP 104622 |
29.37 |
| 2026-03-31 12:00 |
21:11:46.65 |
-03:36:11.4 |
HIP 104622 |
29.09 |
| 2026-04-01 00:00 |
21:11:48.49 |
-03:35:52.5 |
HIP 104622 |
28.82 |
| 2026-04-01 12:00 |
21:11:50.32 |
-03:35:33.7 |
HIP 104622 |
28.56 |
| 2026-04-02 00:00 |
21:11:52.13 |
-03:35:14.9 |
HIP 104622 |
28.31 |
| 2026-04-02 12:00 |
21:11:53.91 |
-03:34:56.1 |
HIP 104622 |
28.06 |
| 2026-04-03 00:00 |
21:11:55.68 |
-03:34:37.4 |
HIP 104622 |
27.83 |
| 2026-04-03 12:00 |
21:11:57.42 |
-03:34:18.8 |
HIP 104622 |
27.60 |
| 2026-04-04 00:00 |
21:11:59.13 |
-03:34:00.1 |
HIP 104622 |
27.38 |
| 2026-04-04 12:00 |
21:12:00.83 |
-03:33:41.6 |
HIP 104622 |
27.17 |
| 2026-04-05 00:00 |
21:12:02.50 |
-03:33:23.1 |
HIP 104622 |
26.97 |
| 2026-04-05 12:00 |
21:12:04.15 |
-03:33:04.6 |
HIP 104622 |
26.77 |
| 2026-04-06 00:00 |
21:12:05.78 |
-03:32:46.2 |
HIP 104622 |
26.58 |
| 2026-04-06 12:00 |
21:12:07.39 |
-03:32:27.8 |
HIP 104622 |
26.41 |
| 2026-04-07 00:00 |
21:12:08.97 |
-03:32:09.5 |
HIP 104622 |
26.23 |
| 2026-04-07 12:00 |
21:12:10.53 |
-03:31:51.3 |
HIP 104622 |
26.07 |
| 2026-04-08 00:00 |
21:12:12.06 |
-03:31:33.1 |
HIP 104622 |
25.91 |
| 2026-04-08 12:00 |
21:12:13.58 |
-03:31:15.0 |
HIP 104622 |
25.76 |
| 2026-04-09 00:00 |
21:12:15.07 |
-03:30:56.9 |
HIP 104622 |
25.62 |
| 2026-04-09 12:00 |
21:12:16.53 |
-03:30:38.9 |
HIP 104622 |
25.48 |
| 2026-04-10 00:00 |
21:12:17.98 |
-03:30:21.0 |
HIP 104622 |
25.35 |
| 2026-04-10 12:00 |
21:12:19.40 |
-03:30:03.1 |
HIP 104622 |
25.23 |
| 2026-04-11 00:00 |
21:12:20.79 |
-03:29:45.3 |
HIP 104622 |
25.11 |
| 2026-04-11 12:00 |
21:12:22.16 |
-03:29:27.5 |
HIP 104622 |
25.00 |
| 2026-04-12 00:00 |
21:12:23.51 |
-03:29:09.8 |
HIP 104622 |
24.89 |
| 2026-04-12 12:00 |
21:12:24.83 |
-03:28:52.2 |
HIP 104622 |
24.80 |
| 2026-04-13 00:00 |
21:12:26.13 |
-03:28:34.7 |
HIP 104622 |
24.70 |
| 2026-04-13 12:00 |
21:12:27.41 |
-03:28:17.2 |
HIP 104622 |
24.61 |
| 2026-04-14 00:00 |
21:12:28.66 |
-03:27:59.8 |
HIP 104622 |
24.53 |
| 2026-04-14 12:00 |
21:12:29.88 |
-03:27:42.4 |
HIP 104622 |
24.45 |
| 2026-04-15 00:00 |
21:12:31.08 |
-03:27:25.2 |
HIP 104622 |
24.38 |
| 2026-04-15 12:00 |
21:12:32.26 |
-03:27:08.0 |
HIP 104622 |
24.31 |
| 2026-04-16 00:00 |
21:12:33.41 |
-03:26:50.9 |
HIP 104622 |
24.24 |